You won't know for sure if she means it ofcourse, only she knows. But give her the space and time she needs. Kissing twice means you done it before, and did it again...so you knew what you were doing.

Answer back how you feel, how you think about all this. Don't be harsh on her, it's really hard if someone cheated on you, if it's "only" a kiss, it doesn't feel like "only" a kiss.

Though if she says she lost your love for you, and she really means it, it would be very hard to start over since there isn't any love enough for a relationship.

I think the best thing you can do is answer her email how you feel and give her time and space and just see what happens I guess...