She's retarded, it's backed by encryption and it's uniqueness. It's essentially digital money that quantifiably has a money amount due to the energy needed to create it. Dogecoin is easy because there's not a lot of them. Bitcoin is expensive due to the fact they made so many. It now takes an entire server room to make a bitcoin over a few days or weeks who knows. Therefore bitcoin being worth 50k isn't that crazy. Also supply and demand creates value not if something is backed by something.