Here is a wild and crazy idea: answers to similar MathOverflow questions suggested going for a Master's degree en route to a Ph.D. Perhaps she (after finishing her current Masters) can enter another Master's program at the university in which she wants to do Ph.D. research. She can at least ask at that university what her chances are for trying such. (It may be possible to do cross discipline; for example a Masters in statistics or computer science might be acceptable before trying for a Ph.D. in mathematics.)

Gerhard "Thinking Outside The Normal Framework" Paseman, 2011.02.23