Great! It's already moving!

All she has to do is back up at the same speed or faster than it, and it'll never catch up with her. If she's moving, then there's no need to reel it towards her.

Of course, she's going to have to deal with the door when she gets there, so Lucky Charm moves all three strings to one hand.
She backs up, going towards the door, and...
...
Whoops.

She trips over one of the boxes of things that was out. One of the strings slips out of her hand, too, as she falls.