I'll break it down for you.
This is for a lot of characters. Obviously some will have a way around the second 50/50, after the initial 50/50.
You block the first 50/50, assuming she didn't leave you a gap to armor through B14. Essentially now you're stuck in a 50/50 of, block the bomb, or jump out/backdash/advancing move(if you have it lol). If she blows up the bomb right away, she's anywhere from -6 to around -11 depending on when the Demo player blows it up. If you delay the bomb slightly like Tarkatan players do with their rekkas, you'll be left at about -6 with no gap. Maybe -7. All I know is it's possible to block Mileena's roll with no gap.
So if you block the bomb, it's your turn. If she lets it rock, though, and then you block it, I don't know the exact frames, but she can easily guarantee another 50/50. You can't really armor out if she lets it rock, unless you have an armored move that really advances. You have to jump out, backdash if you're not in the corner, do something that advances, or just block the 50/50s until she's out of bombs, and has unloaded all of her EX nades on you. How many 50/50s can you block breh?
But hey what about Alien's 7% 50/50s that leave him at -7 or -15? BROKE