I'm not 100% either, but it does kinda seem that with the way she works -being able to both camp and go in- she's diverse enough to win any matchup.Nerfing her kill power more doesn't seem like the right to do to me. She'd turn into a boring character to watch (since she'd need to wear her opponents down carefully and slowly, even mores than now) and a frustrating one to play (you wouldn't be able to afford to make mistakes and if you did you have to camp to make up for it); it'd just enhance everything that's already bad about her as a character (not talking in terms of viability but in terms of her role as a competitive character).
I think her character design is just flawed, she relies on solid execution, and is rewarded massively for it - if she's played right she's nigh untouchable: she needs more weaknesses apart from her lack of killpower, and probably more strengths as well. I'd like to see her needles nerfed for starters, but that's the easy part, the hard part is her character design kinda needs to change and that's gonna take both buffs and nerfs imo.There are other characters which are also just inherently flawed in their design because, Little Mac for instance, the game would be better of without him atm.