Hi first of all I find it hard to beleive you are a lone parent, I have a simmilar problem I have 6 children 4 still at home.I've tried to explain the way I have felt all my life ,that I was different to most,and I'm not MAD.I know how hard it can be to tell and inform children whats really going on in the world THE TRUTH, NOT WHAT'S TAUGHT IN SCHOOL.
The only advice I can give is ,be true too your family in a way that will not scare her and honesty is the best policy. I read in other posts you're thinking of moving abroad , the way I see it ,a good general always fights on his own ground. Wales ,Scotland and yes even England have vast areas to start a fresh 'It's not the place it's the souls around you that make the difference.
Whatever you decide listen to your inner self and you will do the right thing for both of you .
LOVE LIGHT MY THOUGHT S ARE WITH YOU.