Leia nerfed?

I doubt it. 

Mods, turn order, randomly focussing one of your key toons first -- there are ways it can happen. It's also a more difficult counter to execute in 3v3. 

I mean, it's always possible that a recent update introduced a bug, but Leia's a GL and has been out a long time. There's no reason for a nerf. There's been no news of a nerf. 

Best guess is that things just went wrong this one time. but if you want, you can test the squad in Arena before the next GAC round starts.