W.C.
Two weeks is pretty standard and crying for an hour and a half is excessive. She is most likely self-harming because she is having a hard time expressing her feelings in another way. I would try very hard to redirect the behavior. You can teach breathing techniques. (putting your fears in a bubble and blowing them away is a good analogy for children to learn to calm themselves.)You can also explain that the best way to heal hurt feelings is through a hug, and not biting herself for attention. By kissing the booboo that she inflicted on herself only enforces the behavior. She sounds very clever to have come up with this method to explian what she is feeling. I'm sure that she would understand the redirection also.
I would reevaluate whether your child is ready for this type of environment. It sounds to me that she was thriving and secure in the previous environment. Children learn for experiencing the world around them. Not all children are ready for this type of setting that young.
I'm so sorry that you and your little one are going through this. It is very difficult. I wish you the best of luck.