what broke?

ok my dads girlfriend who cant drive at all was driving the truck its a 2001 tacoma and supposidly she was driving 35 and all of a sudden all the lights started flashing and it dropped to 0 and she couldnt use the gas or brake its a automatic so im lost my self and now it wont start because when ti starts you cant tell that its about to go it has 50000 miles on it so whats the diagnosis?

English class.