Are you thinking she shouldn't complain, or that she should like/appreciate it?
What if you could recognize the validity of the situation (that a 2 BR is what you have, making space for her in your daughter's room is what works, and that she is only there 4 days a month so you are not presently prioritizing making a change) while simultaneously recognizing that her personal feelings or reactions are valid, too? It could help. Someone's displeasure with a situation doesn't mean the situation is wrong or that you are doing something wrong (though it's easy to feel that way if you take it personally.) Responding as if the feelings are wrong doesn't tend to help the relationship OR the situation.
She is bummed about sharing space with someone when she visits, which is a drag for her.
It probably takes the form of complaining, which is tedious.
It might help if you make space for her unhappiness as making sense.
at 2:30 PM on Mar. 10, 2013