This is what I have done for my snakes with stuck sheds.

Soak in tepid water (if it's warm to you it's too hot for them) for about 15 minutes. Put a washcloth in with your snake. Stay with her while she's in water. Don't let her get chilled.

After she's thoroughly wet, use the washcloth to gently rub off the stuck skin. Rub in one direction from nose to tail. You can remove the eyecaps doing this too, be gentle about it. If she'll let you, make sure you've got the shed off at the very tip of her snout and around her nostils.

For future reference, when she shows signs of starting a shed, raise the humidity to 70%. A drop of mineral oil swabbed on each eye helps the eyecaps come off.