Couldn't Ironman just pick up on her heat signiture and blast her even if she's invisible? Also, Ironman would just use his image inducer to make 50 different Ironmen holograms...and when Sue's trying to figure out which is the real Ironman, she's blasted to smithereens.
Also, couldn't Ironman just fly up 10,000 feet, lock on to her using his helmet's infrared vision, and just fire a mini-nuke... Or multiple mini-nukes? Ironman also has stealth armor he could use to make himself invisible to Sue.......