It’s not really obvious to me that your statements here are true. You might be right, but I’d like to see some sort of official source or confirmation (perhaps there’s some game data that describes the nature of her gear and abilities?).
I haven’t heard of dash-boots in 40k lore, and power weapons are typically depicted with a crackling blue energy field/sparks around them. Whereas chaos sorcery is typically depicted with red, purple, or green lightning sparks, in contrast to Imperial and Aeldari psychic sparks/warp lightning more often being bright blue.
But there is definitely psychic powers that can alter a characters speed, and even the speed and flow of time. They go by names like Warptime, Warpspeed, Perfect Timing, etc.