Are you close to your Mom?
Does she think of you as a tomboy?
Will this be a complete shock or an extended revelation to what she already knows about you?
Each person's background varies. There are many, many, things to consider. Are they liberal or more conservative and old fashioned.
Do you have a troublesome background or a long steady one?
I am asking these questions not for you to reveal an answer to me. As a parent of 3 girls, I would consider all of these things if one of my children came to me. Or the answer to these questions will play into how I feel about the revelation and accepting it.
If this comes as a complete suprise it may make acceptance more difficult.
I am sorry if I am not as helpful at answering your question as I would like to be. I feel there are so many variables, that maybe asking yourself these questions will help you in your approach.
I know that this poses a difficult challenge for you. I wish you the best.
Sincerely,
with Hugs
Mrs Erocse