That's not your original statement. You included the word 'selfish' when the writer of the book herself said that Emma's goal here is to take over the organisation and divert its resources to helping mutant kind, and not take over the world.
So the answer to your actual question is a solid no. She did not betray the X-Men for selfish reasons, she did it to gain access to a platform for the greater good. That is not selfish.