I wrote an ibuki post somewhere within the last several months.
I think blanka really controlls the ground in that match, the usualls, standing jab, low fp, stand str, low strong, rh, etc.
If you are having problems on the grounds, its likely due to 2 things. 1: You’re letting ibuki jump at you, which is possible. 2: More likely, you are in the range of that kicky thingy special move, so she does like low jab, standing mk(i think), cancel into that special kick move. Sometimes the kick move will be all blockable standing, sometimes they and with a low sweep. Regardless, for all version of that move, they can all be interrupted during the cancel from the normal move to the special with an ex upball. Also, the last hit of the special move kick string can be focused, so you can do some damage and realign spacing. The japanese are very very effective at using focus to get out of ibuki’s stupid kick strings. There was a daigo ft10 set a year or 2 ago, where he showed a lot of possiblities. A lot of other high level play vs ibuki would also show you what you can do against those kicks.
Other than that, the only normal you really need to think twice about is I think her low strong (low fp?) its the one thats straight low poke that can be cancelled into the neckbreaker. Regardless, the low mp is 8 frame startup, low fp is 9 frame startup. Blanka totally has the tools to deal with them (standing fp ftw), just try not to let your low fp get interrupted by it, cuz that leads to the neckbreaker, unblockable setups, and dirty nasty poop.
Hope this helps.