M.I.
I agree with previous posters. I'm not an alarmist by any means, and use the doctor as a last resort. However, what you describe sounds worrisome. I would encourage your friend to seek out more testing with the current doctor or with a new doctor. You didn't mention how old the daughter is, but swelling in the lymphatic areas can indicate a host of different things, some of them very serious. I would encourage your friend to err on the side of caution and push for better answers.
Please keep us posted on what your friend finds out.