Hate to say it, but I would kick her out & sever all ties with her.
Most if not all of these LGBT sites actively encourage married women to leave their marriage. It's all about the sex & excitement & many offer hook-ups & 24 x 7 sex chat as well. Not surprisingly, many female bi/lesbian sites are avid anti-men (so much for 'tolerance', eh?).
You've been dealt a terrible blow. Get started in therapy if you haven't done so already & try not to let your wife's selfish & destructive behavior ruin your life & your family's.
Me: 46 Ex: 38 Married: 10 Together: 12 No Children Separated (again): 09/06/13 Divorced: 02/27/15