what waas the song used in ready or not 2 in the fight scene between grace and the girl in a white dress

The song used in the fight scene between Grace and the girl in the white dress in Ready or Not 2: Here I Come appears to be “Total Eclipse of the Heart” by Bonnie Tyler. A soundtrack listing ties that track specifically to the scene where Grace and Francesca fight in the ballroom, which matches your description of the white-dress fight moment.

Context

That same soundtrack source lists several other scene-specific tracks for the sequel, so this cue is likely the one you’re remembering.

Quick note

If you meant a different fight scene in the movie, the soundtrack page also shows other battle cues like “Grace and Faith” and “Ready or Not, Here I Come” on the album.

TL;DR: “Total Eclipse of the Heart” — Bonnie Tyler.