I don't know how your relationship with you x or stbx is, but with me and my ex we both have decided that it is in the best interest of our daughter to try and remain friends and get along as best we can for her sake. It does take work to do this and I know from experience that sometimes this is not possible(I have another ex that just doesn't get this - it's been 10 years - we don't even talk to each other). And me and my stbx still have are not so good moments - so believe me everything is not rosey but we are doing the best we can.
My daughter talks to her dad everyday on the phone actually it is probably 3 or 4 times a day and he lives less than 1 mile away. But she doesn't want to go over his house, she is ok with him coming over to our house (which is our martial home) but she does not want to go to his house. So what I am doing is going there with her. Which actually works out well for us because 1 it makes her comfortable and 2 it makes me comfortable.
There are other issues that I can't get into but this arrangment is in her best interest. And as I stated it makes both of us comfortable. As of now it is working for us (but there is no one else involved either as neither of us are seeing anyone - so this is probably why this works for us now - it may change later only time will tell)and we still try to do things as a family unit to some extent. We all went trick or treating together and to parent teacher conferences together. And for thanksgiving she went w/ him to his mom's for the morning (they do thanksgiving dinner at 10am I don't know why but they always have) so she went there first and then came home at 3 and went with me to my families. Like I said I know this is not a solution or even a possibility for some people and it may seem a little odd but for her we try to make her life somewhat normal.
So if it is a possibility maybe you guys could try that. Oh course not for the weekend but as an icebreaker. Just last night we went over there, we ordered a pizza, ate dinner and left. Win/ Win for everyone.