That's awesome news.
I know how you feel about not wanting to push her too fast. When I told my mum she was very supportive but she didn't really understand. She asked me if I was going to change my name and when I said probably, she said that it might be confusing and could I not keep my [very feminine] name. It was clear she wasn't trying to be unsupportive, she just had no idea what being trans was. I gave her links to some websites and didn't push the issue, then about a month and a half later she asked me if I'd picked a name yet and that she wanted to pay for the name change.