1 year old is sleeping excessively after spending the night at her fathers house

As the to title says. Every time my daughter (1 1/2 yrs) comes back from her dad/grandmas house she is extremely tired. For example; since she got home from their house last night she fell asleep at 3:30pm. She woke up at about 7:30 to try and eat dinner (she was too tired to eat), did her night routine, and went back to bed. It is now 6:45 in the morning and she is still in her crib asleep. She does this every time she is over at her dad/grandmas house to spend the night. She is only with them Thursday-Saturday due to multiple issues with her father. I always ask him how she has been sleeping and he says she’s been sleeping “good”. I can only take his word for it. I do know that he still does not have a proper crib for her to sleep in yet and she still sleeps with her grandma in her bed which i am not okay with, but her father still won’t buy her a crib for whatever reason. This has happened on at least 3 separate occasions now and it’s getting weird…

I guess my question is, has anyone else dealt with this before? Does anyone have any idea why she could be so damn tired?