No, she never found out. The manga series ended years ago. Although there were many plotlines about Ryoga and Akane, and even Ryoga without Akane, she never found out that he was cursed at Jusenkyo.
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There's an episode where they "THINK" they're in love with each other thus making them kind of a couple, the episode is lets go to the mushroom temple, when akane and ranma accidentally consume love mushrooms they fall in love with each other and ryoga and kuno try stopping them and mousse does everything in his power to stop kuno and ryoga from ruining the relationship, coz when the sun sets and ranma and akane have not yet been cured they will forever remain in love but sadly at the end nabiki tells them they are really not in love forcing them to prove it to her that they are in love and eventually consuming the cure :D awwww
Sadly no, when rumiko finished the manga she didnt indicate who ended up with who, (well not specifically that is) Ryoga does have a girlfriend actually, her name is Akari Unryu and she loves pigs :D she's also as clueless as ryog, oh and they also had a date, but about ryoga and ukyo they dont end up together in the anime or the manga :( well at least not yet :D lets just hope that when they decide to recontinue ranma they make ukyo and ryoga end up together :D