That would be nice

It's really up to the actress more than Cameron, and Michelle Rodriguez (though I like her better than Zoe Saldana in fact) I doubt would really want to reprise the role. But also, realistically, why would Quaritch, Wainfleet, etc. want her back? She means less to the American side than say, Neteyam. if the Americans could somehow pry away Neteyam's memory from the Metkayina soultree (Jamie Flatters IS casted in Avatar 3, fyi) they could get some deep insights into Pandora even if he refused to fight in a new body against his own family and people. Trudy on the other hand, she's a worthless traitor militant that went rogue to them. Though no doubt Trudy is the hottest human female character in the Avatar series.

i dont think they could .. and i dont think there would be a reason to bring her back honestly because Miles Quaritch had his memories uploaded to his avatar body after his death but i dont think they had Trudys memories

Yeah, definitely a dearth of female protagonists in avatar 2 compared to avatar 1. No female Recom's. Also, Trudy was Norm's lover. Damn shame for Norm. I don't like what Cameron did with the Sigourney Weaver character either, it's really fishy that she was born from her mother's avatar body with no father.