What’s your opinion

So my mother and I live together with my 15 month old daughter. My mom spends a lot of time with my daughter even if I’m in the house and don’t have anything to do she will get her and play with her the whole day and give her back to me at night for bed. It’s cool because sometimes I need a break. But now I feel like my daughter wants to be with my mom more than she wants to be with me. She obviously spoils her which annoys me but like is that normal for kids to prefer their grand parents over their own moms. She cries when my mom leaves and she will perk up if she hears her in the distance and look for her but I don’t feel like she does that for me 😫 am I just being sensitive or should I stop letting her spend so much time with her ...