In the Help section of Etsy.
Why do I need to wait 24 hours to cancel or refund some Direct Checkout orders in my shop?
For Direct Checkout orders where the buyer has paid in a currency other than United States dollars (USD), there is a 24 hour waiting period before a refund or cancellation can occur. This is because non-USD orders currently take a full day to process and settle with credit card companies and banks.
We hope to reduce this delay in the future.
For USA I believe you can refund her money right away.
You might want to search again in the Help section
Hope this helps.