Squirrel that did not have the strength to climb up!

I love watching squirrels very much. But unfortunately, I can never get close and take quality videos because these cute animals are scared and fleeing!
This time we met a little squirrel that was sitting on the ground and moving very slowly!
I approached closer, the squirrel began to flee and wanted to climb on a tree, but it looked like this she did not have a force! Later she was able to climb above and she resting on the branch ...