I don't think she will get the sympathy vote now. There's been too much negativity about what happened at the weekend, although we've probably not heard all the facts.
The main point for me is that when it was announced that there would be no dance off, Claudia did not say following medical advice, Anastacia would not be dancing, which is what usually happens in circumstances similar to this. It was clear to me she was choosing not to dance (for good reason) and she should have withdrawn from the competition. I don't think Melvin should have been sent home, but the BBC will not change that decision now.
Some years ago Ali Bastian danced in the dance off with an injured foot. The medics had said it was up to her whether or not she danced, but we never knew what the alternative would be i.e. would she have to leave the competition? This weekend's decision has created an interesting precedent because it appears that a injured celebrity no longer needs medical advice not to dance. I can see this being abused, perhaps by the producers even.
Anastacia is now dancing the Viennese Waltz this week, so the dances were swapped around a little bit to help her with the injury. It's unfortunate she was injured, but I don't think there's anything wrong with her taking part in the show. I do admire her, especially all the charity work she does, but I am disappointed in her after the weekend.