If she wants to try Catharanthus roseus again in the future, you can find resistant varieties but they usually cost more. I've had good luck with a couple of the 'Cora' varieties. 'Cora Apricot' is my personal favorite, but there are a lot of nice color selections.
http://www.plantanswers.com/vi...
http://thedailysouth.southernl...
