Sasha was signed up for two events only: Skate America and Cup of China. I don't see how she can do CoC either--it's only 3 weeks from now, and she can't do triple jumps for four weeks.
I think she strained her back because she basically took the summer off, then went apartment hunting and moved, and she hardly trained at all. It was clear at Campbell's that she was no where near in competition shape, and she probably tried too hard to make up for the time off in the 3 weeks between Campbell's and SA.
I'd say she is without a doubt entirely out of the GP.
I don't think that's such a bad thing. The GPF is in China, December 16-19, just 3 weeks before US Nationals. It's a long plane trip going and coming back at a time when jet lag could seriously cut into practice time. I have a sneaking suspicion that some of the top skaters skipping scoring events is a convenient way of getting out of having to do the GPF. Many of the federations have Nationals in late December or early January; Japanese Nationals will be less than a week after the GPF. It's true that the trip from China to Japan isn't that bad, but OTOH, many of the Japanese ladies (Suguri, Onda, Arakawa) train in the US so the trip TO China will be a drag.