ExH left youngest DD behind

[tinkerbellone]

Background so as not to drip feed.
ExH does not communicate directly with me. All communication runs through his GF. They live together and GF has a DD (6).
(We have been separated and divorced a while).

My DC's see their dad (my ExH) once a week overnight.
Youngest DD (6) refused yesterday & said she hates going. I never pressure them - I have found this makes them worse. So she stayed with me.

Today my eldest DD was dropped off early I asked why.
Apparently GF took her DD and my other DD's to a local adventure park. My youngest DD who stayed with me wasn't invited.

AIBU to expect my youngest DD to be invited? I feel she is being punished and is missing out because she didn't want to sleep over and therefore missed the 'fun' planned for today with her sisters.

@marriedwithchildren5 some of us come from where the OP takes us. No criticism here but more information has come to light since I posted that might have had me commenting differently. I'm also coming from the experience of a friend who had to go to court to get access to his child and had the judge tell both parents that the court had ordered access that no-one should ignore, not even the child. Mum had tried alienation techniques and refused access because the child 'didn't want it'. Judge said most emphatically 'do not discuss anything with the child. She does not get to choose. She would not be asked about contact with her father if her parents lived together.' Now, I appreciate that she could probably refuse to go on a trip to the shops with himif she wanted, but there are many options to this situation all valid, which is why the OP posted in the first place.

I don't think the girlfriend did anything wrong here. She didn't have to take any of your children out. She probably thought you and dd wanted to stay in.

If I'd been told that one of dp's children wasn't going to come to ours one weekend and the other was I wouldn't dream of questioning it. I wouldn't see it as my place to. I bet if the girlfriend had questioned your decision to let the 6 year old stay at home she'd be accused of interfering.

She didn't want to go and is then feeling left out when she didn't go?

Of course you're being unreasonable at by 6 your daughter should understand this.

Thanks for all your comments and opinions.
Sorry about the title. It is misleading. X