I've had that happen before too. Don't worry, Ava won't be [b]that[/b] strong nor powerful. She won't be like Thanos, Odin, or Ultron. Not indestructible, no. I'll put a few flaws to her; I just haven't come up with them yet. 

There will be a final battle where she will be the one that Loki and Thor have to save, since their arguing went too far at a certain moment. A time after they grew fond of her, I mean.