I'm on the 3rd act and I swear every character just throws themselves at me. I've turned them down multiple times but at certain stages in their questline they forget and try again. There's ALOT of game left, build up your reputation with her and try again.
Personally I hate Lae'zel as a character. In EA you could kill her before meeting her but I was unable to do that on release. She's still LVL 1 in my camp and ignore her for the most part.