Good questions. Her international track record, with the sole exception of Nebelhorn 2004, where she finished 3rd in a rather weak field, has not been good.
In 6 of the 16 international events that followed Nebelhorn, she finished 5th.
In the other 10, she finished 6th, 8th, 12th, etc. all the way down to 24th.
In terms of scores, she averaged 134.87, with a high of 157.36 and a low of 114.05 (4CC and CoC '08).
That's pretty bad for a girl who wants to be on the World and Olympic podiums. Especially when that girl lives in a country with some of the best coaches and choreographers in the sport. I'm not saying this is all her fault. From what I've read (articles in the Globe & Mail; other threads, other boards) she's never had a good coaching team or anyone to help her make smart decisions. It's a weird mix of the Surya Bonaly/Tonya Harding sagas, with the same end result: she's alienated her skating federation. They told her that this weekend.
I don't see international assignments or special training in her future. I get the impression that SC spent five years hoping that Leung would improve her skating, but that never really happened. She has the raw talent, but there are still so many issues that haven't really been addressed. Phaneuf, on the other hand, has one major issue: Confidence in her jumps. In terms of the other elements - presentation, speed, posture, line, spins, spirals, etc. - she is miles ahead of Leung. SC might as well back the more artistic skater who's working hard to fix her problems rather than the athletic skater who isn't, whatever the reasons might be.