Toddler imitating

My daughter is 2 years old and her teacher has been telling me that she likes to copy her friends whenever I see her.(eg. Her classmate cannot articulate properly and she follows, her classmate accidentally drop the water bottle and she purposely drop hers.) I thought is normal for toddler to imitate others? Is there a way for me to teach her to differentiate what's right and wrong? Teacher told me that she has been telling her not to copy her classmates but I feel is too vague for her to understand.