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LordBarbossa I don't think male selves are as obvious as we feel them inside.
She might have seen you go from wearing dresses and skirts as you tried to force yourself to conform with the gender you were assigned to your more comfortable style now - but it's easy to put down to a change in tastes... it's not like you went from wearing normal clothes to going everywhere dressed in a clown suit... that would certainly attract attention.
You didn't sit her down and reveal to her that you are a man, so she doesn't know that way.
With that said, it's possible that she could be hiding her sexuality because of society's attitudes towards non hetero people. She wouldn't be the first or last closeted lesbian/bisexual woman.