I was in your same place. My pervert interpreter sounds like your interpreter, but he is far worse. He got away with many things! He sexually harassed me so many times, pretty deaf girls and pretty interpreters. I reported him and he backed off. But it didn't stop him to sexually harass others. He won't interpret everything what the professors said. He summarized it instead. He won't interpret if the professor repeats it.
He still has a job now. He should be fired. I know many deaf students complained about him but they didn't report him, I tried to convince them to report him but they didn't want to get involved. Argh. The interpreter's boss didn't want to fire him because he fears the terp would sue him. Wimp.
Ask any deaf student if they had your same interpreter before. Ask them to document it. Ask them if they reported interpreter. If not, Please urge them. It is the only way to kick her out.
