I can think of a few micro-managing, controlling bosses I've had that aren't happy until they've done it themselves or at least chipped in on the task (and usually stuffed it up in the process). Perhaps this is one of those bosses.

My brain hurts now figuring this out lol

She either re-did it, OR she did the same thing (like printing things off, etc.) so they did it twice.

It is freaking confusing lol I thought I was the only one who thought that

The boss may not have explained to OP how they wanted it done. Happens at my job all the time

Depending on what the task was, it's very possible to replicate someone's work without realizing it until later.