Well, you just met each other at the club on her Bday.
i think you should ask yourself that : Do you like her? And Do you love her? Is she a good person?

If you say so, you should make a move, to understand or to get to know more about her and her mom.

And one question: What do you think about her reason that she lets you know that she likes you ?
Did she ever mention about it?

Thank you!