Her power starts out just being able to paralyze a single enemy for a short time, but it can be upgraded to:
Ressurect teammates Turn the target enemy into a magnet which drags every other enemy nearby to them. Make an enemy an ally. Set the target on fire, syncs up great with the magnet to burn a whole group. Inflict 3 other forms of elemental damage, one of which is slag which causes them to take double damage
She has an entire tree devoted to healing yourself and other players that caps off with the power to chuck a slag ball at enemies. Another tree is focused on crowd control, like the magnet, while another is focused on elemental damage, like being able to create acid clouds with your bullets.
This site has all the skill trees if you wanna check for yourself:
You're the stranger, ain'tcha? Are you looking for a nice, clean place to stay? Madam, I had a nice clean place to stay... and I left it, to come here.