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If she is excessively licking herself, it may be that she is starting to go into heat and licking the discharge to keep herself clean. However, dogs can also get vaginitis which can cause the vulva to be itchy and lead to a dog licking in the area. So she may have vaginitis or a skin dermatitis of the fold of the vulva. Usually with vaginitis there is a discharge, but she may be licking it so much, that it isn't noticeable. You can read about vaginitis here:
If this is a skin fold dermatitis, You will want to keep the area clean and dry. 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.
You might go ahead and take a white napkin and blot the vulva to see if there is blood or if it is something else going on. Dogs can also get pyometra.
Pyometra generally occurs 60-70 days after a heat cycle. It is usually seen in older unspayed females but can be seen in any age. It is diagnosed by ultrasound showing fluid in the uterus. There are two types of Pyometra (open and closed cervix) Symptoms of open cervix Pyometra are a vaginal discharge that may be pus or bloody, lethargy, anorexia, increased thirst and urination, vomiting and diarrhea, and abdominal swelling though the dog remains fairly healthy due to the infection draining from the body. Closed cervix Pyometra symptoms are the same without much of a discharge, they appear very ill, there is usually weight loss and abdominal swelling and is much more extreme. Dehydration, shock and death can occur if not treated aggressively.
Given her age, I'd be inclined to have her seen by your vet before the weekend.
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Since there have been recalls on certain foods, please check the following site to be sure the food your animals eat is not affected. If it is affected, contact your vet as soon as possible. Have your dog seen if they have any symptoms.