Ordered wrong item for customer

One of our elder customer wanted to order a liqueur we don't have in store. So I ordered it for her. The problem is, I ordered the wrong item.

The 2 items had almost the same name. The only difference is: the item I ordered had "coffee" in its name, and the item she wanted had "cream" in its name.

I tried to call her several times to fix the problem but she didn't answer the phone. I also texted her, explaining what happenes and told her to call back.

The thing is, the item she wanted is out of stock from the storage so I couldn't order it anyway. If it was in stock I could just have changed the order.

I was stressed when ordering it because I was alone at work, and there were customers wanting to pay while I ordered the item. Also I'm really tired after working for 6 days last week due to us being short staffed.

So yeah I feel sorry for that lady now, and I am afraid she will get mad when she come to our store to pick it up, realizing it's the wrong item.