I'd chase her down, ask for the thing back, and never ever lend it out again to her, telling her that next time she has to bring things back sooner, or else you won't lend anything to her anymore without you being there to collect the thing right away. Be firm, or you will be continuously made use of.
But that is me

You can borrow something once, but ONLY when I know you well enough (I don't even lend to my neighbors, go figure), and I especially do NOT lend things out that I care enough about to hate seeing them broken.
Currently I am also a borrower, with garden tools. Slowly I am getting the things I need replaced by my own stuff and then my dad suddenly gets this tool shoved in his hands with me saying I don't need it anymore

But yeah.. I am very wary of loaning things to people; I don't even let anyone but my dad (and the maintenance folks) drive my car!