Don’t know how I feel about new babysitter

AB

Today is our babysitters first day at our home watching our 6 months old baby. I let her bring her 2.5 year old daughter with her. I figured it would be good for my son to be exposed to other kids. Well now I don’t know how I feel about this. My son was napping when they got here and she was loud so he woke up. Then the first thing she did was she jumped on my sons Walker and stood on the seat. Her mom didn’t say anything. Then she kept trying to give my son her barbies with long hair so he would put it in his mouth. She runs all over the house and even upstairs where we actually don’t want them to because we have important stuff and we don’t have cameras upstairs. Now, she’s 2.5 so I guess that’s how kids are but now I just don’t know how I feel about this whole thing. Maybe I wouldn’t mind if she was a bit older and understand more? What do you mamas think? What should I tell the babysitter?