Question: My daughter (10 years) digonosed to have tendinitis 6 weeks ago. She did not have any pain any more two weeks ago, but the swelling on and around the kneecap never went away. Shall I worried?

Dear Dr. XXXXXXX Gupta:
Thank you so much for your reply.
The sport means a lots to my daughter, as I described before, once the pain disappeared, she went back to routine excises gradually (with very limited running and Jumping). And some doctors told me she went back too soon, that's why the residual swelling always present. But even without training, it is the same - that is in the morning, no obvious swelling around tendon area beneath and on the keen cap, in the evening, I can see the swelling become bigger, tender (though no redness, no pain). She is a kid, if she feels pain, she would complain and automatically stop doing the activities that causing it, otherwise, she cannot restrict herself to avoid running and jumping. Her coach said the process is normal (to have bigger swelling after training), that I just need ICing it to make the swelling under control. Shall I listen to her? Is Icing better than heating pad? Or I should do nothing, just be patient with it, and hopefully this up and down swelling syndrome will eventually go away? How long do you think usually it takes to clear up all the symptoms? Is it safe to let her use her own body sensor to judge what she can do and what she should not do? Thanks,
XXXXXXX