I just got this Sentret and it's IV's are REALLY good but it's ability is Run Away and I don't
know if I should ditch her and catch one with Keen Eye or just keep this one?
Keep run away. It's hard to find Pokemon with good IV's. Run away isn't that bad of an ability ingame, either.
I would have run away because it is good in game but not usefull at all in wifi battles and that kinda stuff