I think that yes she could use a nerf. I'm not 100% sure where but some of my feels would lead me to say shortening the ult, and for me that's all I would change.
Yes she has range but you need savage accuracy.
If you're asking me the biggest problem people seem to have, if they'll admit it or not, is that they just don't know how to play against her. She's nothing more than a meta changer. You can't just sit around corners as a junkrat anymore, or as well any hero who would wait around corners (IE all the defence heros) she also of course fucks with snipers and pharas so with all that what's the solution? Reaper dva sombra ect. Get in her face but don't get lured into a room. You have the advantage in the open space. Also she has a very small area in which she can grip onto you so if you die by her a lot it's probably because you're movements are super basic