Mom vent! And looking for advice.

Courtney • 💍ENGAGED2019💖SEPT2006💖MAY2016💖💙MAY2020💙 ❤️comming SOON JUNE 2023❤️🐄🐓🐶🐱

My 6 year old daughter just beit my 2 year old son for "not listening". I asked her to take a paper towel and wipe her brother face for me. I heard him throw a fit at first a put it off to he just didn't want his face wiped off then he came to me and showed me his arm. This picture doesn't do it justice it was a full teeth imprint from her. I'm not sure why she did this. Any input or advice on if I should be worried