What words fit this request...I mean, that you can say in front of children, of course!
I suppose it's great that she called you, so you could try to explain WHY this is NOT a good idea...sadly, she'll probably just dial the next number on her list. I actually have seen advertisement of other charitable events where dogs/puppies were raffled off based on entry tickets sold...and wondered what happened...and/or what the winner would do...if they didn't want the dog. These were very 'ritzy' events, but 'money' does NOT equal love or caring, IMHO.
Each of my Yorkies and my kitties is a huge prize, but it is
their 
hearts that
I've won!
{{{Hugs}}}...what a stressful phone call...{{{more hugs}}}