I think it would be a good idea to print off these responses along with a pic of the results of feeding live in an attempt to educate her. Try to keep it civil (I know it's hard). Hopefully, if you convince her that her opinion on the subject may be incorrect, she will be able to prevent some of the horrific incidents we have seen as a result of feeding live.
Here is a pic of the results of live-feeding (note: this pic is rather appaling so please do not scroll down if you are sensitive to these issues)
This pic has been circulated so widely that I was unable to track down the original photographer and the pic remains uncredited.