What?! She's trying to play you! Wise up!
If it's just friends (bloody unlikely) then what's the whole "Let's take it slow and see how it goes xx" BS about?
Stop letting her plant these seeds, she's only trying to weed herself back in. It's the same reason why these people have to have their cake and eat it (i.e. cheating), that they can't stand it when their partner leaves them. She wants you to get back with her so she can validate in her own mind that she was never really the one to blame. She's made her bed, let her lay in it and learn some lessons. Lest she really hurt someone in the future.