Invisible Woman - Overcoming Malice

Quick clarification for Invisible Woman - Overcoming Malice
Does this ability replace her A value with her current D while blocking?
OR
Would this be considered ability damage, where the D value damage is dealt separately from her A?
Thanks!
When blocking, Invisible Woman deals damage equal to her defense.
Does this ability replace her A value with her current D while blocking?
OR
Would this be considered ability damage, where the D value damage is dealt separately from her A?
Thanks!