How do I teach my small dog to jump up on a bed?

She's a lhasa apso and is very sweet. She has no problem jumping down, but just can't jump up. Her legs aren't too short or anything, my grandma has the same size and breed of dog and hers can jump up fine. I know my dog just has to get a running start, but how do you train a dog to do that? I've tried the flying dog technique and using treats already.