This momma don’t know what to do!!

Okay mommy’s I have a question about my 15 month old daughter when she is around other baby’s her age she screams when they just come around her she screams and crud like they are hurting her like today her baby cousin was over playing with her today and all he was doing was playing and handing her stuff and then when he just walks to her she starts to scream and cry for no reason bc he isn’t hurting her at all she just doesn’t do it with him all the other baby’s that she plays with are her age and she does this to all of them and idk how to get her to stop. Mommy’s plz help I have 2 weeks before our son is her..😩😬