Thanks for the additional information.
There are a couple of possibilities here. First, since you were in the dessert, it is possible she could have gotten some contact burns on her paw pads. If you feel as though there are lesions that look like burns present, then it would be a good idea to get her in to see your vet first thing in the morning for appropriate care. These often require bandaging with a silver sulfadine solution in order to help promote healing.
If this appears to be more due to irritations/abrasions from terrain, I would recommend checking each foot carefully to make sure there aren't any sticks or things poking into her foot. Then, I would recommend carefully lavaging her feet with water over her sores, followed by hydrogen peroxide, and then packing the wounds with an antibiotic cream. If she is limping at all in the morning, or if she isn't healing well in the next few days, then I would recommend getting her in to see your vet for a complete exam. And, as always, if you think things look worse rather than better at any point, a trip to the vet clinic is warranted.
Hopefully that answered your question. Please let me know if you have any additional questions or concerns.
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