She had a cold recently is there any relation

In all probability it was a lymph node, our body's first line of defense when an infection is around. The lymph nodes catch the infection, trap it, and then it is destroyed by our white blood cells. Pretty basic description I know, but this is how it works and you said your daughter recently had a cold, a low grade infection.

We have several lymph nodes distributed throughout our body, one or two located in the neck area just under the ear becoming apparent when we are ill.