Fraternization isn’t typically a legal matter in the military. He was convicted of fraternization as a lesser charge during a court martial for rape. That’s not an insignificant detail.
The officer in question, not being accused of rape, had the charge dealt with the typical and customary manner, if at all. It doesn’t say.
Seems possible to me that given the man’s exoneration on rape, they might look more seriously afterward at her role in the fiasco. At least if the issue is dealt with intelligently, but they say that military intelligence is an oxymoron.