She so knows, and she accepts and loves you; that doesn't mean it has to go any further. Just love her back. Coming out to people can be tempting for selfish reasons "oh goodie someone to dress for" maybe that distorts relationships and gets weird? I'd find an excuse to pick up 'mum's dress and earrings' soon so she knows you know that she knows, kiss her on the forehead and let her make any next move. It's not DADT, it's grace. She's a good'n BTW.
