I'm sure she can, but she never should have been cast in all 3 anyway. It's just lazy casting when there are so many other actresses they could use.

It's impressive considering schedule conflicts could arise easily.

Hopefully she will manage it, she is amazing in all 3 roles.
Ps. Kudos for the rare Zoe thread which isn't about race. This forum is rather despicable lately.

in her sleep

It has been annoucned that Avatar 2 has been pushed. James Cameron is applying his usual getting the script right method 1354even if it means delays.

i can't see why not.
Libera te tu temet ex inferis.
pro ego sum diabolus, pro ego sum nex.

I can see how it would be difficult for her to shoot all these movies simultaneously considering most of these sequel movies are scheduled to be released in either 2016 or 2017 (except Avatar 3 & 4 which will be released in 2018 & 2019).
But I don't think these movies will all be filmed at the same timeI read some articles stating shooting for 'Star Trek 3' will start sometime in April this year. while I suspect shooting for the Avatar sequels will start sometime later this year or early next year after she's done with Star Trek 3they will be shooting all the Avatar sequels back to back so I'm guessing it's gonna take a long time, maybe even up to a whole year.
As for 'Guardians of the Galaxy' sequel, well it will be released in 2017 also, so I'm guessing shooting for that sequel will probably begin sometime in 2016.
I think Zoe will be able to manage all these sequels somehowshe'll barely have any rest though, I suspect filming for all these upcoming movies will keep her very busy for the next 2-3 years at least.