My mum was desperate for DD (4) to stay over one of the nights this bank hol. Agreed for tonight. Just got a text saying she's bringing her back as she's upset and wants to come home.
Fair enough, I don't want DD upset. But my mum does this, or similar every time. DD has never actually slept a full night there.
I have been divorced from exH since DD was 2 - she goes to sleep there one night EOW and longer in school holidays etc, and is perfectly fine without me when she's there. 
She has a good bond with my mum as my parents have spent a lot of time with her since she was a baby. Last year, DD had gone to stay one Sat night and I woke up in early hours of Sun morning to parents banging on door saying they'd had to bring her home as she kept waking up asking for me. Also had similar six weeks or so ago, when she asked for DD to stay, moaned at me cos they hadn't had her to sleep in so long (because they bring her back every bloody time). I explained saying she could, but she had to keep her all night. She rang me at 10 saying can you come get her, she's upset. When I picked her up she was fine, just tired. It's also scuppered plans on several occasions.
I don't rely on them for babysitting, I don't ask them to have her anymore as it always turns into this massive palaver. But then they pull the guilt thing on me and say why do you never let us have DD to stay, she loves spending time with granny and grandad - which she does, but why bring her back every time!
Sick of it now.