Cryptocurrency is very hard to explain. My favorite thing to do for the past couple of years is when I'm at social events I start up a conversation with the person who had one drink too many and begin enlightening them on the wonderful world of cryptocurrency. It's always a very entertaining exchange.
My brother-in-law called me one morning after a party and asked me "did we talk about some weird internet coin world last night?" lol
Give it a try--------->Next weekend is yet another opportunity for me to "cryptocate" someone.
There are some decent youtube videos you could have your mom watch that will help explain bitcoin/cryptocurrency to her.