Now that I’ve seen the Texas Showdown 6 qualifiers, I’ll say with a lot more confidence that Elena vs Yun is not a matchup that’s TERRIBLY in Yun’s favor, if at all. I waited because I didn’t really know what high level Elena vs Yun went like, but to my surprise, it really does go a lot like what I saw in the videos. If you guys wanna see what I’m talking about, go to combovideos and download the TX6 qualifiers for 3rd strike and watch Combofiend play that one Yun player.
Combofiend doesn’t do anything ground-breaking to fight this guy (I don’t mean that as a slant to either of their abilities, lemme make that clear :P). Basically, this match comes down to three things:
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Being very aggressive against Yun when he doesn’t have meter,
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Knowing you have the advantage against an offense mounted by Yun, and
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Not fearing Genei-Jin.
Watch as Combofiend displays ALL of these things.
On point 1: Yun doesn’t have a lot of good ways to keep Elena out. Combine that with the fact that her mixup is top notch, and you can see that playing offensively against Yun reaps great benefits. In one of the rounds, Elena deals so much damage to Yun, that even after eating a whole Genei-Jin combo, the match is still even. Yun deals low damage outside of Genei-Jin, and he takes a crapload, so dish it out when it’s the safest - when Yun can’t do Genei-Jin. 
Lastly, don’t fear what will happen if Yun quells your rushdown game, because he won’t do a lot of damage, and also because of point 2…
On point 2: Genei-Jin aside, what does Yun really have to get in on Elena? So far, I’ve seen pretty much nothing. The ground game DEFINITELY goes to Elena, and Back Roundhouse beats Yun’s divekicks like no one’s business. Combofiend definitely showcases this by Back Roundhousing Yun’s dive kicks ALL DAY. These combined reasons show that Elena clearly has this match when Yun doesn’t have meter. Now…
On point 3: People are too scared of Genei-Jin. While I think you shouldn’t UNDERESTIMATE the power of Genei-Jin, being completely scared of it will get you in a lot of trouble. Personally, I think that Combofiend is too bold in the face of Genei-Jin, but it’s a risk reward thing - watch how one time his boldness has him eat another combo, and then another time, he catches Yun activating Genei-Jin with Brave Dance. That cracked me up, lol But really…
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While this is debatable, I suppose…don’t sit close to Yun when he has his bar, cos you don’t want him to combo into Genei-Jin if at all possible; try and get him to activate it cold turkey. From there, he still has to get in, and you have the advantage keeping him out.
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Also, when Yun activates outside of comboing it in, you now have the chance to make him play chase by either finding an opportunity to throw him (blocked shoulder tackle or dive kick), or just backdashing and jumping backwards with random attacks. Even if you do get caught eventually, it’s a lot better than taking a whole combo, and a lot safer than blocking everything, hoping he doesn’t catch you with a high/low or his command throw.
Another random thing that I think Elena players know and Yun players generally don’t: Command Throw into those crazy Rising Kicks of Yun will WHIFF. This is usually the preferred way to start a combo after his command throw, and it doesn’t hit Elena. I don’t think a lot of Yun players have this commited to memory (especially if someone at a major tourney qualifier made this mistake!). I’m not saying this is incredibly crucial, but it’s nice to know.
So basically…Just get in his face until he has meter, and then stand your ground in the face of Genei-Jin, and you’ll see good results. I think the match gets a whole lot easier once you stop fearing him so much; Elena is one of the few people in the game who can get away with this so easily vs. Yun, so take advantage of it!
Lastly, don’t fear what will happen if Yun quells your rushdown game, because he won’t do a lot of damage, and also because of point 2…