I am late in answering... and.. I feel strongly on this subject...

Yes... this is sexual abuse... my understanding is this is an authority figure.. and a very much an adult male... and she is mid-teens....

She.. should not feel that she is responsible for this happening - this was most definitely not her fault...

Drinking.. or not drinking... the adult male is responsible for his actions...

And seeking help for the teenager.. do so very, very carefully... because people are judgemental and sometimes mis-informed. They may let their lack of knowledge on the subject - get in the way of really looking at the situation. And at this age - mid-teens - every non-supportive words on this situation can cut deep and last for a very, very long time....

And... it takes very specialized training to help... in a situation such as this.