Yeah, completely safe, unseeable 50/50 mix-ups, which if guessed incorrectly will result in you losing somewhere between half and all of your health bar. You're right, she's a walk in the park.
You don't lose half to full your life bar with "50/50 unseeable mix ups" unless you can show a video of a real match of that happening I havent yet see it in tournaments, and I certainly dont fall under 50/50 chances either i avoid it most of the time, perhaps you have trouble reading her moves?
Go into training mode try to pull off a full health combo or better yet try to pull off these mix ups with someone who knows Viola well. I have been tested against these mix ups that you are talking about they are nothing of chance let me tell you why they are not guaranteed, for one most of these mix ups will not lead to big damage combos you have the ones you cannot see like every character (2k or 1a is an example), as with pokes such as low pokes or 1A's which do the least damage as a combo.
I guarantee that you will not be able to pull off combo with if your lucky more than 120-140 damage max in a match, if you get lucky and get manage to pull off a combo after getting a hit in and the person does not ukemi, since you have to time it right otherwise it wont even work and with her full damage combos, your better off trying to pull off alpha patroklos JF's flawlessly if it is a poke like 6+BK 2A WR B the best she could do is around 60 damage as a combo, assuming she gets really close to you and if your good enough you don't land things like mitsurugi's 2KBE often, because of really close spacing issues which is the flaw of Viola's mix up strategy you can totally avoid it, just like how ringing someone out require certain spacing and position depending where you are in the stage, this is the same her mix ups are useless at a range.
And her moves are NOT safe test her moves in training mode before you make a claim; 3B = punishable 6A+B = punishable 4A BE = punsihable and since her biggest combos must start out as 3B in a combo or at a start of a combo, how does that make her combos "safe"? when you see a mix-up coming do you just stand there? your not supposed to guess your supposed to prevent it, if you think its by complete chance somehow you can still cut your chances in your favour, with side stepping and jumping as an example making it 70/30 or just nothing and only taking a bit of the damage by jumping or something.
If your on the floor and you think it just happens by chance doesnt that make it predictable, there are only certain moves that can hit you even that would cut your chances in your favour even more, but you do not have to even play it like this I could play a chance game with any other character; if my opponent had that mindset.