First thing I would ask, is that you hve an open mind. From your post it sounds as if you're assuming that she's wrong in saying what she did but if you assume she is telling the truth, what would you do? Would you want to be with a man that has the capabillity to do this?

Ok so that being ssaid and it's already been said that more evidence is necessary but.. considering it's your daughter, who's side would you rather side with? I don't know about you but I definitely would give my child(ren) the benefit of the doubt first. Period. NO ifs ands or buts about it.

Thing to consider to decide wether there is any weight to her accusations. First, is this out of character for her? Does she have any reason to lie to you about this, in other words, is this the length at which she has shown to go to to get her way ever before? If it's a new behavior and NOT like her to say such things, I would seriously consider the fact that this may be true. If it's a typical behavior that she has engaged in to manipulate you or a situation, perhaps it's not so honest. This is something you need to ask yourself about your daughter.

Considering it sounds like this is new, you have not alluded to your being estranged from your daughter or that you've been distant and/or had trouble before, I'm guessing it's not something particularly common in your interactions with her but this is just my analysis from the outside. Only you can know this.

Just some things to think about.