Adad... I feel for you. I have been thru this and I WON! It is the hardest thing you will ever do - but in the end - no matter which way it goes... try to find empowerment in this experience because it will require more strength than anyone knows. (So you actually learn something about yourself in the process) Especially when kids are involved. I admire you and how you are staying strong and focused on your daughter. Keep doing that. But seriously... the BEST thing that worked for me was just going BLACK as hell and putting my foot down.. (NO TEXTING to update her on your D - she will just think you are doing it to make her feel guilt - which she SHOULD) and yes sticking to it.. no back steps. It worked so swiftly I was amazed. The beginning was ssoooo hard because I kept going back and forth... but once I hit my wall and went black... wow.
The grass is just NOT greener!
She will realize this soon enough.. and you may or may not decide to be there... it is your call. Stand from that position and you will feel like you have more control over what is happening.
I know it is hard to eat.. man I lost so much weight so fast.. went 10 days straight with no food.. just tears. But you have to get past that and take care of yourself. I quickly realized this and felt so much better once I found a way to feel like I was in control of SOMETHING when everything else in my life seemed to lie in some other damn OW hands.