Although there is something that I do not fully understand: It appears that this whole incident with the gorilla is part of your daughter’s training. You mentioned that they had to learn about gorillas and there even was one in the class. In that case, maybe this gorilla does not represent a person but the attitude of many people (animals symbolize the hidden nature of people). Maybe this is what she needs to focus on. Maybe she needs to learn to understand people and help them in some way. Maybe through counseling. This may explain the fact that the gorilla was fond of her and she was OK with it, although a bit tense. In that case, the licking of the teeth and gums is positive. It then speaks of the gorilla wanting to “taste” what she says (the words). Moving from the front door to the backdoor speaks of accomodating someone in another way, maybe at their level or maybe under the radar. Anyway, I am shooting in the dark here.