At 13 I did not have any interest in boys.
Throughout my teens I felt the odd flutter, but could not relate to any of the sexual issues around me.
At 21 I felt painfully different to everyone else because I still did not have any feelings for anyone, and no romantic relationships.
When I realised that heterosexuality was not necessarily the rule, I wondered whether my problem was that I was trying to be what I was not. But even by 21 I still had not discovered what I was sexuality-wise.
Once I realised that I did not have the same feelings as my peers, I would have liked the reassurance NOT that it was OK to be gay, but that it was OK to be different. That I did not have to define my sexuality, but just give myself the time to explore it when I was ready, not when society expected me to be ready.
Do IMO, OP, your dd's sexuality does not matter at all. Having satisfying social relationships is far more important. I think it will help her (and you) to believe that she does not have to concede to social expectations and 'be' something, and that she can address any thoughts of sexuality when she herself is ready.