Why does my dog keep licking at her privates now? She is 7 years old and has barely started licking there. The vet said she’s fine but she keeps doing that.

There are many possibilities. Please see a different vet. Inline with the vet's opinion get tests done to find out what's wrong.

UTI

I'm assuming no redness or skin irritation bc your vet would have seen that at least.

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Pop a teaspoon of salt in a cup of room temperature water, dunk her in it for a minute skin clean.

Lemon juice. If you're willing to try anything.

• Check for Bindi eyes or any foreign object/splinter.

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Something is wrong.

Do not put anything prescription topical on her bc what's meant for hoomons can cause a pet’s eyes to bleed.

• When on heat, a bitch will lick constantly.

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Go to your chemist and grab a tube of canesten cream (internal and external) and stop itch (external ONLY). So long as her skin isn't red raw or bleeding, dry the external area, apply the cream, then give her a bone/chew toy/ stick to chew on. The cream plus the distraction helps in most milder situations.

Please give your pup a treat, a collar free neck rub, and a gentle kiss on the head from me 😎✌️

You can very gently apply a small amount of canesten cream inside her vagina entrance and vulva however its toxic if she licks a fair amount off so use a rolled up towel for an anti lick collar and even though the lickng makes everything except a cut much worse, please let her lick when you dont understand her issue while you have no relief to offer her until the vet provides you with his/her specific instructions regarding what's going on. At that medicated point, the vet will probably not allow llicking.

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• A Fungal infection may be present.

Fungal /thrush

Internal examination (I honestly think it's internal) and so forth.

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Skin scraping test

• A uti infection can have that affect.