Ask yourself what you would have done.
You're a woman having a drink with a senior male colleague. The next thing you know, you're waking up in a bed full of vomit feeling deeply ill and confused. You're half-undressed, but you might have done that yourself. You don't necessarily know if intercourse took place (condom). You have no idea what happened. But you do have a professional responsibility to fulfill, so you force yourself to shower and dress.
Then you find out that you're not flying - another colleague has reported that you and the pilot were seen drinking and that you looked out of it, and that the pilot has admitted to boozing. You fly back as a passenger, feeling sure that this is a serious issue, and that the company will have to investigate what happened. On the journey, the pilot suggests you get your stories straight. Warning bells start to ring.
It's only now - hours after the black-out - that the bruises start to show. It begins to dawn on you that you were sexually assaulted.
So you tell the company what happened, and what you think was done to you. You're not charging the pilot with rape - perhaps because you think it's now too late to gather physical evidence - but you DO expect the company to take your complaint very seriously. You expect them to investigate whether other female crew have had problems with him. You feel that he should not be allowed to abuse other female colleagues. You feel that the company should protect you.
The company puts you on furlough while they look into it. You agree, thinking that the investigation will take a while to conduct.
Time goes by. You go back to work, expecting that something will have been done. Instead, you find that the pilot is still flying and that the whole event has been buried. You've been conned.
Right, so now what do you do?
Report the rape to the police, six months later? You'd need the support of the company to provide whatever evidence they had at the time, and you're now far from convinced you can trust them. You have reason to think they'd support the pilot over you.
Go to the press? You'd probably get sued by the pilot for defamation.
What's left?
Seems to me this is her best option. What would YOU do?