Well done you. [hug]
Her first reactions are perfectly normal for many parents and in your case, represent a great platform for moving things forward with her support. You must be very relieved.
And yes, there are going to be things she won't understand but it's your job to make her understand these feelings you have. The only way I personally know of to understand yourself and these feelings is to act on them, and you've made the best start you could hope for by doing something about them.
Mums are great friends and allies to have in this process.