I don't think it's out of the ordinary for her to continue to call herself a scientologist.
There clearly are several examples in history of people who sincerely believe in a philosophy, dogma, or religion, and idiots running the organization that's supposed to represent that belief run it into the ground.
There are several conservatives who hate the GOP, Catholics who hate the Vatican, Trek fans who think Berman and Braga (the last producers) ran the show into the ground.
Scientology, while IMHO a religion based on bogus tenets, well I can see several people seeing some good out it's belief core. Any religion, even one where the founder formed it on a desire to make money, could be based on some good philosophies.
One thing I've found interesting is whenever someone protests against the Church of Scientology, the Church often times gives out a response pretty much on the order of finger pointing..."She must be bitter", "she is a liar", etc.