This can be a tough one because it is a natural behavior. When dealing with this, I do not completely try to eliminate the problem but modify it to an acceptable level.
To start I would adjust the amount of contact your dog has with people. Teach her what is acceptable. Give her a certain amount of time to interact with people but let her know when enough is enough. When she starts licking, take her in another direction like playing with a toy for a short time. She must also learn to go into a relax mode lile sitting or laying in a designated place.
If you have used correction training, a tug on the collar and a firm no will also get the point across. I have also used the bitter apple spray for dogs that liked to chew on hands. It works on most dogs. as Lip said, I would spray it on your hand or arm. I do not spray it directly at the dog.