Hi there! Well I guess it really depends on how you feel about coming out to her. If you trust her, think or know she is going to be supportive/accepting and feel comfortable in coming out to her, you could give it a try. It is really up to you though if you want to come out to her. How do you feel about it?
That's probably a good idea. Wait until you are in a comfortable and suitable location and then tell your friend (but only if you want to, not because I'm saying this or because anyone else wants you to). Good luck for when you do tell your friend