Not really. She was always into boy toys. Hated wearing a dress and saying no I'm a boy! Sorry man, but it changed the way I thought about it, and glad it did. She's a great person and if anyone wanted to do any genetic experiments on her to try and change her I'd stand firm.
That is not always indicative of homosexuality. Can it be? Sure, but there are plenty of tomboy girls out there whom are most definitely straight. These gems are known as unicorns.