The problem is that the SSPX appears to be stonewalling now, which tends to give credence to her charge that they stonewalled then.
The sspx has no authority and no training to investigate crimes. If the lady wants justice, she should go to the cops, and the sspx will cooperate with them, if the story holds water. The lady is barking up the wrong tree.
.
The only reason the Vatican can investigate their own, is because they are a separate country with their own laws and police. This doesn't apply to the sspx.