Getting Grandma Online

My grandma wanted to move from MSN-TV to a real computer because her bank's website was no longer supporting that platform. After setting up the hardware, I called her in for a quick tutorial. Try as she might, however, she just couldn't log in to her bank account! She would try and fail then I would try and get right in. Finally, I had her speak what she was doing while I was hovering over her and when she spoke "one" I didn't see her finger typing a '1'. So I had her do it again - it turned out she was typing 'l' -- a lower-case 'L' -- in lieu of the number '1' -- "That's a one on a typewriter!" she insisted. How do you argue with that?