How would you mommas feel if a girl constantly brought your so food but no one else, every time she talks it’s directed towards him (says his name) and doesn’t say anything to you while your right there, calls him instead of you at 11pm when she knows your laying down, starts smoking because he does?
Then specify that if any of her stuff is found in your home after said date it will be left on the curb.
Finally block her number in your SO’s phone NOW! Also your SO needs to refuse anything she brings him.
She is being disrespectful towards you and your family.
If she doesn’t leave soon she will most likely try to get into his pants as soon as she can OR worst case she may attempt to accuse him of something because he keeps refusing her advances.