Triple digits mach speed. Her dc should be around country or continent level. Or higher since she is hyped to be a world threat, by the end of the series she has enough control over her powers to stop a multi-planetary phenomenon. Her abilities consist of traveling through dimensions or manipulating time by teleporting, she can use this in combat to move in a short burst or speed herself up dashing, she has a magic stone that allows her to summon fireballs and some sort of sound manipulation with her scream that incapacitated the Wild Hunt along with everyone in Kaer Morhen. She can BFR people in another time or world if she grabs hold of you.