How do you help someone who is hard to learn?

My mother is so PC illiterate she hasnt a clue how to order anything via internet or check her email. I have shown her a thousand times how to check email and it just seems like she has a defeatist attitude. Any suggestions how to keep your cool when showing someone how to use email a million times and they still dont get that when you click the paper clip your opening your attachment via email? How do you keep your cool? It drives me insane. I love my mother dearly but I cant stand her defeatist attitude about it.