The Grangers did an amazing job at putting Severus" powdered bezoar potion into an intravenous line as a first-line defense as he kept brewing the antivenin and his mother was tending to Fleur. She looked in pretty bad shape, judging from all of the bruises she had on top of the missing wing. At least she wasn't Infected, I don't know if Severus could keep it together if she were in the same condition as Harry was.