Imagine for a moment that someone got his arm bitten off by a shark - let’s call him Bob. Bob’s arm is completely removed from his body, with no hope of reattaching it. Would you feel comfortable saying that anything bad that happens to this arm will not hurt Bob? Even though you’re not in Bob’s body, would you acknowledge that completely severing the link between Bob’s brain (or his soul) and Bob’s arm means he can no longer feel anything that happens to it?
That is our argument for why she couldn’t feel anything: the destruction of her brain either destroyed her, or severed her link to her body. Either way, the effect is the same.