Once you've folded it once it becomes a lot faster. Two thirds of the last panel can be folded in a few seconds by folding a waterbomb base either end (Your fingers push the sides in and your thumb flattens the top). However I know that when I was learning I struggled with this fold, hence the longer step by step.

If it would help you could copy the link into your calendar a week before her birthday. Or if you're happy to pay postage I could send you ten or so in the mail as they fold flat and would fit in a standard envelope.