Instead of just the gift card, use my old classic move. Send/give her the GC along with handcuffs in a nice little box. Leave a note that tells her to pick something sexy out for "us" and then make it into a night together. Anticipation is beyond sexy. She'll be so fucking giddy in that store picking something out for her special night with her special man. It becomes a bonding experience, the whole thing.
Then you get together that night, she throws on her outfit feeling all sexy and such, you tell her to lay down while you take care of her....then you punch her in the fallopian tube and accuse her of cheating on you. That whore