i need help/rant

so this is my first time posting in this app but me and my girlfriend are expecting she is 17 weeks pregnant, and we are both 17 im almost 18 and she will be 18 in 2 months. But her mother keeps saying that she cant leave and she wants me to move in, i would be fine with but there would be 10 people in a house. and the house they live in is super small, but my house we would be have two or three rooms but her mom keeps saying that she needs to stay she says that she will miss her but we are just gonna be about 10 minutes away. i dont know what to do can someone give me advice and please no hate full comments im an emotional guy but thanks for the help and you all have a great day or night thanks