She doesn't dance as heavy of a workload as the other principals. Part of it is injuries. But part of it is technique -- for instance, she struggled as Waltz Girl of Serenade and that wasn't a role I expected ballerinas to struggle in.
I could see if they did a ballet about, say, Anna Pavlova or Marie Taglioni that they'd interpolate some of their most well known numbers into the ballet.
Uh ... the choreography just doesn;t fit Swan Lake. It's more a 9 minute virtuoso display and thus the perfect gala piece. I also couldn;t imagine anyone doing the Tchai pas in an Odile costume,