handmade jewelry return policies?

Last week I was contacted through my website from someone who bought my handmade earrings from a store in Olympia, Wa.    One of the earrings had broken and she was wondering what I could do to help.   I was surprised that she didn't to attempt return to the store that she bought the earring from...   I told her I would be happy to fix her earring for a small fee ($7- which included shipping back to her) or suggested she try going to the store perhaps they had a good return policy and I would then deal with the store.  These earrings had to have been bought long ago (though she said she has not had them "that long")  as I haven't shipped this kind of earring to that store in over a year.   Her response was this "I appreciate your reply, though it is somewhat unsatisfactory. I had hoped for a replacement or a free fix (I would have to pay shipping) Furthermore, I figured you would want to see the problem to alleviate future misfortunes.  The store is in Olympia and I am on the Peninsula...Lets keep the dialogue open?"  
I am incredibly annoyed that this woman assumes that my time and supplies are worth absolutely nothing.  But I cannot think of a polite way to respond to her and haven't as of yet.   She did not purchase from me, so why is she trying to return to me?  I don't want to upset a potential customer or potential other customers whom she will speak to but as I mentioned I am (well ok, let's escalate) infuriated.   I can only assume the store already refused the return.
Let's face it, things break sometimes, no matter the quality, but there has to be some sort of cap on timing, not to mention a charge to fix.   I am not Nordstrom, Kohls or some department store (who also may not accept such a thing back when not purchased from them), I am a handmade jewelry company. I am already struggling- why is this ok?  
I do accept returns when purchased from me (whether you are a store or a single customer), and also exchange things.  I have exchanged a necklace that the person didn't like the way it looked when they got home- for a ring.  They were perfectly happy.  I stand behind my work but somehow this just doesn't seem fair.  Does it to you?  These are the earrings:

sterling silver handmade square hoops

handmade jewelry every day- www.myfriendroze.com