I wasn't there but I heard all about it. It made me smile really. I'll have to applaud her one of these days. According to the conversation by Sasami:

The reception was beautiful. Everyone was socializing and the King even came down to see his eldest daughter off as she and her new husband exchanged vows. Misaki hugged everyone until Funaho managed to get her seated and... sedated.
Mihoshi sat at the bar alone for a bit. She spoke with the bartender for most of the night. They seemed to be into each other. Mihoshi's changing expressions couldn't prove that though. From growing angry to sad to happy over and over again would confuse even Washu had she been there. All seemed well. The couple got up to make their toasts. God I wish I was there.
"A toast! To old and new love. Friendships made and even lost. Everything's a learning experience and I've learned how to love thanks to my wife Aeka."
"And a toast to you my dear Tenchi. The man I love and plan to love for all eternity. Even death won't due us part."
Applause, oohs and aahs then the crowd became one big mass of rhythmic moving once again. Mihoshi finally turned her attention away from the bartender who was cleaning the bar far on the other side. She stood up and glanced over at Kiyone. Did I mention that I wished I was there? Mihoshi made her way to the middle of the dance floor. She carried herself with a sort of dignity. With all the courage she could muster and the backing up of 15 shots of Sake she was ready to propose a toast.
"A toast! To dark secrets and men who fuck women and then just walk away! To men who say 'It was in the heat of the moment!' To guys that don't tell their wives that they slept with someone the night before they got married!"
Kiyone dragged her legs across the floor though each step seemed to make them feel more and more like cement. She clamped her hand over Mihoshi's mouth and demanded that she stay quiet. There was a dead silence in the room and all anyone did was drop their heads or push their drinks away.
Finally, Aeka stood up. She looked Tenchi in the eyes. Or would have had he not had his head buried in his hands. Aeka need not ask if it was true. The expression of pure horror on Kiyone's face told her all she needed to know. And in a fleeting moment, Aeka reached over for the cake knife. No one dared stop her. They wouldn't fall victim to her tantrum. She's cold as ice when she needs to be. Cold like me. And I guess on that one accord we felt each others pain. Because Sasami said she said my name before she drove the knife through her own heart. She died with the humiliation that she had married someone that didn't love her. And her Jurian disciplinarian actions were of no use on an earthling that had no concept of the importance they carried. I think I respected her then. There was nothing to say. No wrongs to make right. Nothing "I'm sorry" could have made better. All there was, was an undying adoration for a person that she thought loved her back and he denied her that love. She was nothing without him. And so she was better off dead. The King fell to his knees. Misaki had already fainted. Mihoshi stared with unfeeling eyes as the Sake surged through her veins. Kiyone let her grip on Mihoshi go.

Damn, I wish I was there to see it!