Starting to feel like I'm at my wits end with my 2 year old. When I had her grandparents have her…

Starting to feel like I'm at my wits end with my 2 year old. When I had her grandparents have her for an entire month in May while I was in Indiana packing and getting everything ready for me to move out there with them. She was completely fine with them, sweet, barely any tantrums and friendly with them. But now every since I've been back she hates everyone but me, she is constantly throwing fits and screaming if her grandma or her uncle try to come near her and play. I don't know what to do, I've been trying to discipline her to let her know it's not right to try to hit them when they try to get near her but she doesn't quiet understand yet. The separation anxiety is still very strong with her towards me, but I just feel like it's gonna worse. There are times I just don't want to go out for errands because of it. Did anyone else go through this too?