She’s melee only until level 7, assuming you even have her mutation unlocked. Even then, her level 7 mutation requires her to build up heat in melee unless you also have her legendary both equipped and activated. All of her abilities are short range, and she suffers immensely at long range.
Unlike Miko and Alani, she has no way to heal herself without just hiding somewhere and hugging one of her sunspots.
Her sunspots deplete their own health to heal you or nearby allies, and also deplete their own health when attacking enemies, so you can’t even deploy them to support frontline fighters since they’ll lose most of the healing from damaging the enemies.
Couple that with the fact that her sunspots can TAKE damage from outside sources, and are incredibly susceptible to AoE, and all of the damage they take means they can deal less damage themselves and provide less healing.
Her healing beam is ridiculously close range and sacrifices your own health, not to mention the fact that it depends entirely on taking an augment.
Ambra does NOT need a nerf. Her beam casting range (healing as well as lifesteal) needs to be closer to the max beam range. Her sunspots either need more base health or to be immune to damage from outside sources. Seriously they rapidly deplete from healing and damaging, and two of the augments on one level turn them into single-use charges on contact.
If you can’t kill Ambra, it’s because you’re not trying hard enough. You can melt her at long range as well as close if you’re 1v1. She’s suffered enough nerfs already.