I think the main issue here is the communication.
If GF wants to go out to give you time with your DDs when they are over, that is a perfectly valid approach. However, it would be much healthier if she were to tell you that is what she is doing, rather than avoiding the children and avoiding discussing the fact she is avoiding them. That isn't a mature way of behaving in a relationship.
Similar with you keeping it down so she can sleep, and sleeping in the hall, even though she hasn't even asked you to do so. Why would you do that? You don't have to apologise for having your children in your own home behaving like children, especially as you rarely see them.
About the mornings when she gets up late - why do you feel you have to be quiet? It is concerning that you feel you have to limit your activities with your daughters to placate her, to this degree.
Unless you can both have a serious and practical conversation about your role as a parent, and both of your expectations about how contact time will be, this will keep having a negative impact on your time with your kids. You want to be spending your time with them, not thinking 'is my gf annoyed by the noise? Why won't she have dinner with us?'
It sounds like you might have different expectations about what your contact time looks like. But as a parent it is important that you are able to have a proper conversation with your partner about this. Otherwise there will just be more hurt and confusion.