Am I wrong for letting this woman keep my baby?

Olivia

My boyfriend’s best friend’s fiancée has been keeping my baby. My boyfriend and his best friend have been friends for years. Lately, his fiancée has been keeping me and my boyfriend’s baby. She’s very sweet, is a stay at home of a 2 year old already, has a very clean house, and most importantly there aren’t random people just coming in and out of the house. Well my grandma and mom asked who was keeping the baby and I told them and they FLIPPED OUT. Like they acted like I’m letting a complete stranger watch my baby. Also, we live in the same apartment complex as the friend and his fiancée. Am I wrong for letting her keep baby? My baby is one.