Ok firstly i must say i dun agree with such stuff but it is
always possible that this happens.
Changing from a boy to a girl is his gender orientation. It means
he felt that he is a woman trap in a man's body. Note, this does
not say anything about his SEXUAL ORIENTATION.
Therefore being a 'girl', like any other girl, she may have lesbian
tendencies too. Understand?
Gender and Sexual Orientation are 2 different things.