Camille's struggles

Camille bit a classmate at school on Monday. Ugh! She has bit other kids but no one at school until now. I actually had hoped we were moving past this because it had been awhile since she had last bit someone and because her teachers at school had told me she seemed to have learned other coping mechanisms. She is teething badly again though and I think that is when we have the most problems with this. Then she bit Av this morning. I was outside starting the car and I came in and Av was crying. Camille was just standing there. I got down on Camille’s level and I said “no bite” and then I put her in time out. She started crying and it was a “my heart is broken cry” so I hope I am starting to get through to her. She is also starting to cling to me. Whenever I leave her sight she loses it. I have to pry her off of me when I drop her off at school and I hand her over to her favorite teacher who she then clings too. How can she be so sweet and bad all at the same time?