Until you see the vet, which you should do, get her to drink more fluids to flush the bladder, and give some plain cranberry juice to help acidify the urine.
These infections are usually treated with antibiotics. You will need to visit a vet for a prescription. Switching to a natural or holistic dog food can also help.
If you absolutely have no money, (BEEN THERE!) you should buy Greek Yogurt at the grocery and give your dog 1/4 cup every day- but you REALLY need a vet.