My step daughter is upset with my 11 yo

My step daughter just turned 16 yesterday and had friends over for a sleeping. My son is on the spectrum and wanted to go down to the sleepover but I kept saying the sleepover is for big kids. He kept sneaking down there to talk to the girls and making my step daughter mad. I ordered the girls Chinese food and my son pizza and watched a movie with him to try to keep him away. I ran a bath for him to keep distracted. I didn't know however he couldn't find his bath toys so he got out and ran downstairs NAKED. I was in the kitchen. My step daughters friends laughed and she got more mad and started yelling and left her sleepover to sleep her bedroom. Today her friends left and she was yelling to my husband how my son ruined her sleepover and she hates her life and all of us... I feel bad because I really tried to make sure she had fun