What an amazing ability vs token stackers and autothrusters!
Sadly, she's another example of Day 1 erratum because, as-written, she doesn't function.
Dice cancellation is not a modification. The "attacker modifies defense dice, then defender modifies defense dice" timing sequence does not apply: canceling results happens during the "Compare results" step unless otherwise specified, and, unfortunately, it's meaningless to cancel any remaining focus/blank results by that time.