B12 shouldn't be safe, it being -7 or -8 would be fine. Then make B123 safe at -5. MB breath should be + and regular extended breath should be -5.
Also, B2 1+3 is absurdly unsafe. And it's not even that good anyway, and you have to MB it to get like 200 dmg. It needs to be at most -8, imo.
Honestly the gaps aren't as big of an issue as her horrible frame data. When you compare her frame data to characters like Aquaman and Superman, it's laughable.
Like, look at AM and SG' B123.
- Aquaman's B123 starts low, is advancing, is PLUS on block, and with MB can combo for 400+.
- Supergirl's B123 starts mid, is advancing, is -9 on block, and it ends with the 3 with no opportunity to extend the combo.
Or look at Superman vs Supergirl.
- Superman's F23 is safe in block (-2) and leads to 400+ damage. His breath is also safe.
- Supergirl's B12 is negative ELEVEN on block, and leads to like 280 damage. Her breath is unsafe unless MB'd.
Even if you buff her frames, she still won't be top 10 because she will still have trouble building meter and doing damage.
What crazy good "gimmicks" or "mixups" does Supergirl have when not in the corner?