It sounds very much like Jill has an allergy. You are on the right track. Cleaning her paws thoroughly with baby wipes after each walk is a good way to help reduce the effects of contact with potential allergens. Bathing her weekly in an oatmeal based dog shampoo would also help to reduce the level of allergens on her skin.
I would also consider giving her benadryl up to 3 times per day. She can get ~1mg per pound. Benadryl comes in 25mg tablets, so if she weight ~12.5 pounds, she can get 1/2 tablet every 8-12 hours as needed for licking. Benadryl is very safe, and the most common side effect is to make dogs sleepy.
It is possible that there are other conditions affecting Jill's feet. Some dogs will develop infections between the toes and need to be on antibiotics. Less common but still a possibility is ringworm (a contagious fungal infection), or mange (a microscopic mite). These conditions would require specific diagnostic tests by your veterinarian to rule them in or out. Treatment is also very specific to each condition and would require prescription medication.
If Jill is normal otherwise, I would start with the simple management methods (wiping feet, regular baths, benadryl as needed) and if that doesn't take care of the problem (or at least reduce it significantly) then have her seen by her vet.
Good luck and I hope this helps.
You're quite welcom!
Let me know how she does. You can always go back to this question and reply to me without having to give another deposit.