Hi,
It's very kind of you to try to figure this out.
It is difficult to tell what could be wrong without a much closer inspection.
You might put it into a wide very shallow saucer of "clean" rainwater. ie like a plastic dinner plate.
I don't know if it would say? , it might get really spooked .
Sometimes a soak can help and at the very least will help it from becoming more dehydrated.
If it is feeble, you could move it to a more protected area, away from the exposure to additional predators.
It's sad sorry

Be sure to handle it with damp hands / 'cup' it when you move it/ keep your hands close to the ground to prevent it from falling or leaping.
Be sure to wash your hand really well with soap if you handle it.

Lynn