Basically the idea is that her motivation for going evil in the first place was due to the fact that she was persecuted in her own time. Then, after she realizes that it is written in history that Squall will kill her, she turns her attention towards changing history via time compression. The fact that doing so would also give her complete control over space-time is then obviously part of the motivation too.

I'm glad to hear you liked it anyway. About R=U, if you meant #1 spot in terms of most interesting theory, well then I can't say much about that, but if you read the R=U section in the FAQ you should discover that the theory can't really be said to have the #1 spot in terms of most plausible theory!