When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Sounds like the multifunction switch (blinker, wipers and what not). Pull the covers on the steering column and look for anything obviously burned. That's the good place to start. And since it happened when she turned the blinkers on, that indicates it's more than likely the multifunction switch. Once you get in there it can be an assortment of problems, bad ground, too much current draw, etc. But find the burn marks first.