From what we do know of the crime, the victim's story never changed, and she exhibited none of the motivations sometimes seen in these types of cases - lust for money and lust for fame. She's pursued neither, and in all aspects her behavior has been consistent with 'victim of a sex crime'.
I agree, and that's important.
The only thing that confuses me, about your specific point, is the D.A's decision not to put Lueke away for ten years.
If he's got a witness who holds up under cross, he's got hard time for Lueke with no problems. And if that's what the defense lawyer is looking at, then the defense is going to accept a bargain involving a lot worse than time served, right?
I therefore surmise that the victim's credibility isn't quite what Geoff concludes it to be. ... I could be wrong.
.....................
Once again, if you are truly talking about a situation in which she did not consent, then Lueke should be looking at 5 years, 10 years, the death penalty, or pick a card.