TheSunRisesInTheEast
Why does it upset you so much that your MIL wants to spend time with your daughter? You are lucky that she wants a relationship with her, many young couples don't have the luxury of having a night out together or time to themselves to just chill and enjoy one another's company. A grandma/granddaughter relationship is very special, my two granddaughters bring me so much joy. I hope that you can see this from your MIL's and daughter's point of view and let them have time together occasionally, it benefits everyone in the long run.
I was lucky in that my MIL did not want a close relationship with my DCs. Although they did stay with her couple of times, one at a time, when they were little.
They came back to me having slept in the clothes I sent them in, unwashed, teeth not cleaned, hair unbrushed and having been smacked several times for not saying pardon or sitting still.
According to MIL they were the most bad mannered, naughtiest brats in creation. She said this in front of them adding that it was no surprise to her considering what an awful rude mother they had.