How long do you give someone to make a return?

[sel0262]

I  told a buyer on August 27 to return an item for a refund. I have not received the item nor have I received any message from her.   I have messaged her several times asking if she has sent the item back.  She will not respond to my messages.  What do I do at this point?  

She did have to be reminded several times to pay!  I suppose she will need the same for making the return.