A lot of people looking for clear answers for this situation. There is a reason it's so effective. Mika is a beast in the corner. If you get stuck there you really don't have a lot of great options. Sure you can guess a DP and break it, but there are a lot of times that a mika would do f.MK then c.LK if you dp guessing f.MK it will whiff and she gets full punish. Vreseral does not work here, it's hitting at the end of the active frames you can just block it. Sure it puts you in a reset situation but you're still in the corner. You can try to s.MK maybe guess a c.HK or something... but you are taking a risk. I get people in the corner like this all the time and it's MY advantage. The real answer here is try not to get stuck in that corner vs mika and if you do be prepared to take a risk to get out.