I realy didn't know that so many women have mil's like mine, I am so sorry to hear how much this hurts you. My in-laws live 20 minutes away and never see my kids maybe twise a year if were lucky and only if I take them over there. My husband does not stand up for me at all, he never has and won't stand up to his family either. He sat next to me on the couch one day and listened to his brothers live in thing tell me how worthless I was and called me every name in the book and said nothing. So I know where your coming from I used to apease them do nice things for them in hopes they would acnowledge my kids and nothing worked.
So now I don't call them and the only time they call here is when he's home, they like me and say they love me but it is my kids that get hurt every time. My son is 4 and the last grandson for them and my baby girl is the last grand baby my son asks when grandpas going to take him fishing. Grandpa says he will and never does and forget about babysitting they refuse, they wont watch the baby cause shes in diapers and they are surprised when my son won't spend the night on the rare occasion they ask.
The thing I do is avoid all family functions I can, we do the holiday thing only christmas cause the others dont exist to them. The sad thing is my dad is deceased and he is the only grandpa they have I also have two daughters that are 12 and 7. Now they will take my oldest any day she's old enought to help gather wood or work with the dogs, but they won't deal with the other three. His brother lives behind them and his two boys are 13 and 14 they spend every day with them and they get kicked out of school and off the bus daily. My kids are a-b students in sports and never get into trouble, so I don't understand how my kids get left out.
You are doing everything you can to apease his family but if he can't realize what is going on I would send him to family functions alone. Tell him and them if you want him here we come too we are a family and a package deal take it or leave it. Do not expose your daughter to bad behavior from either side let her grow up loving who she chooses and keep doing what your doing. Bottem line and believe me I have told mine this too my kids come first and if I'm not appreciated then my kids arent either. If they make you an outcast and your husband does nothing then maybe the marriage isnt meant to be maybe a seperation would be enough to wake him up but talk to him and let him know that you do not have to put up with them you can leave if you choose. If me in-laws dissrespected me in my home I would have showed them the door, and next time not invite them next time. Good luck I feel for you I do I know what your going through, my husband finaly realized what they were doing and even though he doesn't say anything to them he doesn't baby them either. When we had our last two kids and he realized they were treating them bad he quit going over there and they call and say why don't you call he tells his mom never his dad, that he is upset that they dont see our kids. There is always an excuse they work alot or thier tired he doesn't listen anymore and I'm proud of him for that. Only you can stand up for you and you daughter and you have done a good job of that keep up the good work.