explain to her it is not right to do so use accidentally drop water bottle as an example, what if your water bottle broken and no water to drink? need to do a lot of talking😅 and I agree sometimes can be vague for their age to absorb
It's very normal for toddlers to copy others, that's how they are learning new things and also because they want to fit in with other kids. I find it quite strange that the teacher would have concern over this.
My 2 years old girl is also same. she imitating everything we do.