My concern is that they might not make her a companion because I find it easy to just not side with her, games sort of pushes that.
Yes, this is true. As most people tend to play "good", Larian have pushed you away from the evil path ( i.e. embracing the tadpole ) at every opportunity, presumably to avoid upsetting players accidentally. This was a little counter-productive when they were asking EA to take/test the "evil" path; it took me 4 plays to successfully be "evil" in this game!