If we were to go for the politics explanation route, then I at the very least agree that it being “the last night of her training” needs to be replaced with something else. Make it clear that she didn’t train for that long with him.

But your description in general has brought back the following potential replacement in my mind: “Leia sensed that she could best serve the galaxy in other ways.” It’s more vague while still being more of an actual explanation than the whole “I sensed it was the end so I stopped.”