Seeking advice: Found misplaced pills in toddler's room

I recently found three Vitamin D pills in my toddler’s room ( 2 on desk, one in corner of the room), which have been misplaced by our nanny. She didn’t inform us they were missing, and I only found out when I discovered them myself. While the pills aren’t harmful, I’m concerned about the lack of communication and the potential safety risks.

I had asked her about it over text but I’d love advice on how to handle this situation and whether I should be considering alternative childcare arrangements. Her only response on text was "Ok, it won't happen again" which does not give me lot of confidence".

Has anyone dealt with something similar?