Penelope 64 - Term SLC 6-5 - Why did i walk without my crutches?

Starting from:

Today is Penelope visiting the harbor and after a while she takes both her crutches in one hand as she feels so good in her foot that she can walk with only her cast shoe.
She soon begins to feel pain in her foot and begins to use her crutches as support again.
Unfortunately, her foot hurts more and she takes off her cast shoe and starts crutching.