Sharlee, it sounds like there are 2 or possibly three different issues going on here.

First are the baby teeth and the ones that have to be removed due to being "bad". Please re-read Jerry's post. There may be a small fistula draining the infection from the tooth which would make it relatively painless by relieving the pressure.

Secondly, the lymph nodes are supposed to swell up when there is an infection. A blood test should reveal an elevated WBC. I would imagine however there they do not have a baseline to compare with, only the standard parameters.

Third, she should be on antibiotices for 2 weeks. If there is no response then she should see and ENT right away.

An MRI would be a better choice as it reveals soft tissue much better than x-rays, should it come to this.

It is also pretty common for children to have problems with their primary teeth and cavities can be transferred to the adult teeth coming up - that was my childhood experience.