There were a SURPRISING number of scenes with Fisher, although I swear in at least three scenes they reused the same clip of her and just overlaid new lip movements.
It's impossible to tell if this was cutting room floor footage (with new dialogue overdubbed) or digital composites. Doesn't matter.
Kinda creepy actually. I know SW is not serious moviemaking and everything has to be given a nod and a wink, but recycling dead characters feels wrong.