No there isn't. She'll only scrape it out again.

What you can do...
If the weather is very warm and dry you can lightly mist her with a plant mister.
You can make sure she gets off the nest every day to eat, drink and poop. This is really important. Most hens do this without any encouragement but some will just sit tight, loose weight and general condition.
Provide extra food for her away from the nest and a small bowl of water at the nest site if you wish.
If you do have to lift her from her nest in order to make sure she eats and bathes you must make sure she wakes up fully from her broody trance. If when you move her to where you've provided food she sinks back down into her broody crouch, she isn't properly awake. You need to see her standing and preferably walking.
Don't disturb her eggs!