I really just can't see what's "broken" about Supergirl in her current state.
She rewards good fundamentals and footsies without being insane in terms of damage.
She can't zone because her trait puts on limits so if anything she is a counter zoner, especially when you consider her lasers only do 3% and her teleport that is easily reactable
She is extremely meter dependent and has tons of exploitable gaps in strings as well as strings canceled into lasers that can be armored, backdashed, parried, or straight up punished by a fast starting string.
She has no 50/50s and her restand actually has her slightly negative on hit so its about conditioning your opponent.
None of her flight cancel "pressure" is plus so its all about mind games.
Her walking lasers require a huge amount of time to charge and resources.
She isn't very threatening in the air so you won't see her jump in on you for constant crossups like say Batman.
Please tell me what exactly makes this character unfair because all I can see is she rewards anyone who knows their spacing.