2 yr old fever 2x a month ranging from 101-103, last two have had no other symptoms. Cause? Take her to doctor again? Recommended blood work?

Most likely viral. There is always concern for fevers in a child. However, it is most likely viral f there are only cold or no symptoms and your child is doing well. Of course, you can take her back to the doctor to re-address your concerns. Would not recommend work-up based on these symptoms, but her doctor may recommend some other tests.