Are the lumps hard or soft? Does she get agitated when you touch them?
95% of lymph node inflammation is due to infection and can be treated either with time or with medication (if it is a bacterial infection).
Normally, lymph nodes (if this is what these lumps are) are small, squishy, move around freely and are tender when inflamed. When they are hard, fixed to a bone, tendon, etc. is when your doctor may be concerned.
I didn't have a baby with swollen lymph nodes, but when my daughter was 7 weeks old, I found one on my collar bone. Be diligent and follow-up with your doctor. In my case, it was Hodgkins lymphoma. I'm doing really well now, but I really had to follow my instincts and be persistent as none of my blood work triggered any concerns.
The internet will be your worst enemy until you see the pediatrician. I'd advise staying away from it as much as possible so you don't get yourself panicked.
Good luck, and please keep us all posted on what you learn.