I gave my daughter 2 ml of Motrin for like 5 days in a row due to teething, now she’s throwin a fit at bedtime. Could it be related?

Probably not. It is possible to have a motrin allergy however there is usually a rash associated with this. Once the motrin is out of her system it goes away. In the absence of rash it does not sound like a reaction to the motrin. You are giving a relatively small dose. You could try 5 ml of tylenol and see how she reacts.