Yes she needs to be told that the behaviour is wrong and abusive (something she already knows)
No she doesn't!! That's the whole point of the thread. OP asks, 6How seriously would you take this?6
The answer: Extremely seriously. This is sexual assault. It is a criminal offence.
There is no need to sugar coat it. Yes, she may have withdrawn from the blunt and honest answers, but she can't wipe them from her mind.
It takes time for it to sink in. It takes time to accept what has happened to you. She will need some time to think things through.
But she knows that when she comes back, people are who believe her. Who understand how awful it is. Who can advise and support her.
It's no good telling, ach don't worry, he's just trying it on, etc. That doesn't help her at all. In fact, it will help the situation continue and perhaps escalate.
what would you think if a man stuck up a finger up your anus in a shower at a gym, say, without asking first?
...and did it repeatedly even though you told him to stop?