If this is a skin fold dermatitis, you can see a build up that may look like a discharge especially in the folds of the area. You will want to keep the area clean and dry if this is the cause. Benzoyl Peroxide wipes are also effective for cleaning the folds as well and to keep bacteria in the area down. You should apply miconazole cream to help clear the dermatitis if it is yeast type dermatitis. You may also want to have your vet prescribe an antibiotic to help clear this infection up. Once the infection itself is cleared, keeping the area dry and free of bacteria with the wipes should help keep it cleared. You can read about skin fold dermatitis here:
If your girl is overweight, getting your dog's weight down will also help as being overweight does contribute to the amount of skin folds in the area.
Until you can have her tested by your vet (urinalyses), be sure she has clean fresh water at all times and access to an area where she can urinate. If she becomes unable to urinate, then it would be considered an emergency and she would need to be seen immediately.
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You should have your dog seen by a Vet for any UTI and should not administer any prescription medication without notifying your vet first. I hope you will reconsider the poor rating.