In a recent interview with TotalFilm mag, actress Rose Byrne, who played Moira McTaggart in X-Men: First Class, stated that even though she would like to reprise her role for Days of Future Past, she hasn’t heard any plans yet:
“I don’t know. I would love to be a part of it, but I’ve not heard. I don’t know what they’re planning yet.”
Technically, her statement could be misconstrued as her not being given a copy of the script yet, but the “I would love to be a part of it,” sort of gives one the idea that she hasn’t been approached for a part yet.
As for Moira McTaggart, if you’re familiar with the character from the comics, you’d know that there’s still a lot of mileage for the character, as she has yet to form significant relationships with the wheelchair-bound Professor X and Banshee.