Instead of the Psi-blades being created with her psychic energy, which she knew couldn't effect Emma's second mutation at all, She created the blades with telekinetic energy that would hit her body physically rather than mentally.
One by one, Betsy threw each blade with more intensity than the last, and she hit Emma from all different angles in an attempt to weaken her shell. She knew once she broke that form, Emma would be greatly weakened. Betsy knew she only had seconds to do this. She had to help Jean.
Just curious, is that a legit or even possible move? And would it affect diamond-Emma? I've already responded, but it doesn't matter, I can think of a way that Frost can used it to her advantage, but for future reference..?