I hate to read this Tombo, but as others have stated - at this point it is about how to best protect your daughter and yourself. Your wife made a selfish choice and it will fall upon you to offer your daughter a stable environment. Regardless of how you may feel, don't speak poorly of your wife in front of your daughter OR allow family and friends to do so either - especially, don't drag your daughter into the divorce. Again - I'm very sorry you are going through this and pray you find peace.
There’s been a lot of really good things to say and good advice offered on here. This one hits home with me personally. My parents divorced when I was around 6 months old. Mom and stepdad raised me. I NEVER heard anything good about my biological father. He’d come and go to see me every now and then. No doubt he wasn’t perfect, but I’ll never know the truth and will never know the whole story. Just 1 side and not sure if all of it was true. To this day, my mom and biological dad still can’t sit in the same room together if they’re at the same setting for my son’s events or whatever. I’m 46 yrs old and it still is very awkward for me if they’re in the same environment. So, with that being said, put your feelings towards her mom and what she did aside. Make your priority all about your daughter and how things will be for her. Don’t speak ill of her mom. If she asks questions you can be honest, but don’t volunteer any info. Prayers up for you.
