To be honest, theoretically, Juggernaut should be able to advance. It's within his powerset. The juggernaut cannot be stopped from moving if he wants to move. He can be redirected, but not stopped in forward momentum. If she just tried to hold him in place or from advancing period, she would fail. But she could toss him into the air using his own momentum, etc.
And pre-phoenix marvel girl is a joke compared to Maxima. Scans of him taking on someone bit more powerful would help Juggernaut's case alot.