How can I make a cheap cast for a foot?

not a good idea to give her a cast a cheap way. you should just go to the emergency room and see what they tell you. or call. it might cost some money but she's gotta get healed. if not, google it then. but that's insaneeeeee!

This is definitely not a good idea. She really needs to go to a doctor. They may need to set some bones to ensure that is heals back correctly. Hospitals are willing to set up payment plans that make them more affordable. I think I paid like $25/mo. But if you are set in doing a cheap cast, I don't remember the name of it but you can buy plaster like they use in art classes to make molds of your face. The only thing is that any home made cast will probably end up sticking to your moms skin and not really allow for air to get into the cast which will definetly make matters worse.

Zip-tie two boards to her leg

http://suppliescentral.net/instructions.html

this link has instructional videos and also has links for the supplies

hope it helps