She's clearly not going to hatch the eggs and if she had she'd have been back on a full food and water regime three weeeks ago. I think you can see the problem here - she's probably very underweight and possibly anaemic and dehydrated. I would immediately take her out of wherever she is, check her for lice, and put her in something like a puppy cage, with feed and water, in a breezy place but shaded from the sun. This should get her mind off being broody. Put her, still in the cage, under cover in a safe place overnight. In the morning try scattering some grain on the ground in front of the cage and let her out. She'll probably have forgotten all about broodiness. If not, repeat for a further day and try again. Don't put her back with the rest of the hens until she's regained some weight and her comb is red again or she'll be bullied and pecked.