Oh, Viola, I'm so sorry this happened to your sweetie. This definitely needs to be discussed with the care provider--and please also talk to her about where the daughter is, when you stop by and don't see her. If they can't answer you satisfactorily and put all your worries completely to rest, then I would definitely highly recommend trying to find a SAHM or nanny share or another similar arrangement.
My son was 16 months old when he started at an in-home daycare that I initially felt totally fine about, but then grew to trust less and less. There were biting issues that I absolutely felt were not appropriately addressed, and other things that worried me a little but I decided not to push it for the sake of preserving our relationship with the caregiver. Then, he slipped and fell at home and gave himself a good goose egg on the back of his head... We took him to the ER and the doctors told us to monitor him *very closely* for the next 24 hours. I wanted to stay home with him the next day, but I was pregnant and trying hard to save up all the paid leave I could--so I brought him in to the daycare and begged them to call me if anything AT ALL happened that day. When I picked him up that evening, he had A NEW GOOSE EGG on his forehead!!! I was shocked and asked what on Earth had happened, and she shrugged and said, "We told him to stop running and he didn't listen to us." He was twenty months old, OF COURSE he didn't "listen"!!!! He needed CARE at that age, not a curt command and a SHRUG!!!!! I couldn't believe it and argued back... Within 20 minutes, she had informed us that he could no longer come back to her daycare.
Don't let it get to that point with your care provider. If you are uneasy, please find another situation that makes you feel safe. I am so, so sorry this is going on, and my heart goes out to you--it's ridiculous how difficult it is to find a good care provider for a young infant. I will be thinking about you and hoping that this is resolved to where you feel good about your children's care.
She's here! Baby Yoshiko arrived on 2/7/15, and now we are a family of five.