New babysitter

So I tried out a new babysitter before I start back working next month. Idk if I'm being paranoid as a first time mom or if I have a legitimate reason to be upset. I dropped my son off at 0900 am to her house fed and diaper changed. As soon as I stepped in I was already concerned because there was more kids than she said it would be, and my son would be the youngest (4 months). Fast forward to one pm I go pick my son. As soon as I step in the house I get upset, my son is asleep in the living room by himself in fisher price sit me up chair with a blanket wrapped around him. All the other kids and the baby sitter are in the kitchen. So I'm like why didn't you lay him down somewhere ? Her response was she didn't want to wake him wtf!! So I go to wake him and it takes maybe two or three minutes which is also strange, my son always wakes right up at the smallest noises. Am I overreacting? Should I trust this women again? Or do I legitimate reason to be upset??