As others have said she needs to check her oven temperature. Most are not accurate.
I know each time I use a different stove, I have to adjust my cooking time and temp to allow for variations in temperature.
Other things to check:
Which rack is she using, lower, centre or higher?
Is the bottom element working, if the tops burn and the bottoms do not cook, it could be the bottom element is not hot enough, the rack is too high etc.
Is she at altitude? Your profile says you are in Wisconsin, but is you friend baking at the same elevation?
Lastly, is she turning the oven knob up to broiler before setting the temperature? I once used a stove that if you did that only the top element would work, even after you turned the temperature down. You had to turn it all the way off to reset it.