I would be making her a boot, wether it works or not it may help. She's a little worst then what I had picture. Those toes need to be laying flat, is she a Maran? just courious. Definitely some sort of deformity, I think I would try to get her some vet wrap, wrap each toe so that they are straight maybe even get some popsicle sticks to help them go flat or place the vet wrapped toes on a flat carbboard. and see if it can correct itself. It will take several months before it does but then again, She maybe to old and this may have been going on for to long to correct itself. If you prefer not to make her a boot then all's I can say as long as they are not bothering her or she's not in any kind of pain, you can just leave her a lone. As long as she can get around, might want to watch her toes nails, if she can't scratch and keep them trimmed you may have to trim them...
you may want to try and make a place for her to rooster to where she is forced to curl her toes to keep her balance when roosting...
Personally, I would some how or another work on a boot to get those toes completely flat...
It's going to take several months before you can get those toes to correct itself..