That's what I was going to suggest if she didn't mind a wool blend. It comes in an amazing selection of colors, too! These links go to the Plymouth site and the encore selections. These are all worsted weight even though only one says it.
This one is just like Encore as far as content. I've tried it and it's very nice. Don't have any long term experience, but since it's the same company and fiber content I'd assume it's about the same.