EDIT: I have more advice than I know what to do with thank you so much, I'll hopefully be able to convince her to let me back up and wipe the phone. If she doesn't consent to that, I also have some good direction on detecting anything malicious. Thank you again <3

ORIGINAL POST: Can anyone point me toward some resources on detecting and removing stalkerware on Android?

A friend of a friend has just gotten out of an abusive relationship and I've been asked the look over their phone and computer for any stalkerware the ex might have planted. I'm fairly confident in my abilities on a PC, but not an android phone.