Licking excessively can be a sign of nausea, taste reaction, anxiety, stress, boredom, or discomfort. Her oral cavity needs to be examined for oral foreign bodies, oral tumors, or trauma. I am concerned by your description of her throat spasm. This can be very serious if the airway becomes compromised. Have your dog examined by a veterinarian before this occurs.
You need to check her mouth by looking in it, also if her teeth are bad that could cause this, you diff may want to see a vet