your in luck my friend haha i main jill/hawkeye/dante
jill-cartwheel assist-she doesnt really have any good assist. And none if her assist help you save dantes ground bounce for combo extending :/. But cartwheel does allow you to confirm off dantes air grab 
hawkeye-forgot name of assist but the one that goes horizontal helps with approaching
dante-jam session-anti air not much besides that unless someone can input anything
like you said jill is an up in your face character so the hawkeye assist is perfect for her. Its fast and has some durability not much though most other beam assist will beat it out. Danteās jam session is best for anti air since jill as you know does not belong in the air. Its good for people who like to super jump spam, my friend does it all the time with every character for some reason idk why.
gameplan: hawkeye assist feral crouch dash go for the overhead somersault into her MMHS loop. If they block it just rinse and repeat when you can youll get a hit eventually. If the opponent catches on to this another way to approach is 1. hawkeye assist then qcf H kinda unsafe but adds some meat to her qcf H. 2. the better way depending on your skill level with jill is hawkeye assist qcf H feral cancel into feral crouch dash into overhead it makes them think your are going to hit them with hawkeye assist and the qcf H but just got for the overhead instead. A nice reset with hawkeye that works a good amount for me is ONLY IF YOU THINK YOU CAN HIT W/O GETTING PUNISHED save hawkeye for later feral crouch dash overhead into the MMHS loop i think 2 reps then land H call hawkeye assist feral crouch forward/up dash H into a another full MMHS loop into super if wish or if it doesnt kill the character Its such a nasty mixup works midscreen and in the corner. I havent found a legit way to combo off of jam session b/c of how many hits it does but you can jam session then dash and catch them with a basic abc combo into low command grab.
For incoming character mixups if they know not to hit butons against jillās somersault( some people just dont fucking learn ) dont call hawkeyes assist to help with the mixup instead jam session feral crouch and 1. dash up or 2. dash forward up or 3. simply dash behind them before they touch the ground 4. or dash behind them then feral crouch dash up back to get in front of them again if you have feral crouch on lock like that. jills purple costume actually helps since it somewhat matches the jam session but it doesnt really matter.
FREE RAW TAG/COMBO with jill if you do her air M knee drop(must be done from MHS into air H into air M knee drop)it creates super fuckin hard knockdown thats just as long as dooms if not longer but you can actually get a free raw tag if you would like. What i like to do with jill is do the knee drop raw tag in dante do cold shower(qcf M) into million dollars does pretty good damage since the damage is reset from the raw tag haha so sick.
and you mentioned anchors and stuff well if you through the dante thread there is some good stuff about having dante for anchor. jill can actually be a battery since she can kill off of pure resets so if you need to kill a character with meter do so but if spending the meter isnt going to kill the character go for the reset. But jill may not always be the best point character. I would recommend hawkweye or dante for hulks/dorms/weskers and anything else you think jill cant handle so yeah be smart about your point character choice you can loop bigger characters without having to somersault which is why i say sent wouldnt be such a threat to jill since all sent players do is attack with overhead and low H jill can easily cr.M under his beam and can punish his air.S and shit with somersault. I dont think somersault punishes his leg(has way to much super armor). Hawkeye is good for spacing and keep away against gay shit like hulk/nemesis/ wesker etc.
Dante and hawkeye have really good synergy since his assist and fast and mixed with a teleport is even better for dante mixups and hit confirms. If you call hawkeye assist while dante is in DT double/triple overhead mix cross ups. Also a nice way to get in is call hawkeye assist dantes missles(qcf HxH) into DT teleport very meaty.
characters i wouldnt recommend going up against is def dante since he can do 2/3 overheads in the air jills somersault wont matter by the time he switches from air s. into hammer. Another one is chrisā¦my friend plays a pretty damn good chris despite what he thinks but chris does so much chip damage and his mines and fire grendaes make it impossible for jill to get near him unless you get lucky and dante and hawkeye wont help you get in. Another is Spiderman my other friend plays a good spiderman. Spiderman punishes jill so hard.
some other stuff i havent really messed with is jill/dante team hyper combo dantes last for a long time so you can feral crouch dash mix the hell up out of the opponent while they are stuck in block stun. not sure how you get a legit hit confirm of it though since million dollars fucks with the reset and etc.
thats all i have for now man but its nice to see another jill player. Iron man is a good choice to since his beam assist keeps them grounded but iron is a technical character too. its nice to have a semi derp character like doom or hawkeye.
NEVER DHC MGS INTO MILLION DOLLARS MGS IS ALREADY PRETTY DAMN SAFE NO NEED TO PUT YOURSELF INTO A POSITION WHERE THE OPPONENT CAN HIT YOU IF HE CAN TELEPORT.