What “damage “ does she think will happen if she has sexual intercourse.?
She is misinformed about how this procedure affected her body. ( or you are- was it a complete hysterectomy or partial ? Was she put on hormones?
Insist on a consultation with her and the Dr to find out exactly what happened.
OR .... This may mean she just doesn’t want to have sex any more and you need to figure out if you or your marriage can withstand that.