Injury time?

The Toddler started out today with an injured knee. Yesterday she was still doing gymnastics, and running around...

We are not aware of any injuries, or bumps, or falls! We cannot see any problem, nor does she complain when we touch the knee.

She got up, and she was limping. Complaining about her right knee! And of course demanding to be carried around...

We though she would soon forget about her knee... But she kept at it for the whole day! She did not walk on her own, but was happy to sit/being carried and order us around.

How do we know when it is something to be worried about? Or only ippikonders?

 

Hope all would be forgotten by tomorrow?