Cashier or Angel?

So I went to Kroger's today before work. And I found a nice shirt that I thought one of my brothers would like, and it was on sale. Or so I thought...I went to check out and the shirt was $40. I told the lady who was managing the self checkouts that I didn't want it cause I thought it was on sale. She told me I had to punch in my Kroger's card number. I told her I didn't have one. So...out of the kindness of her heart, she punched in her number. I got the employee discount instead of the on sale price. I thanked her and when I finished paying, I turned around cause I was gonna say, "Have a nice day" to her. But she was no where to be found. I looked further, and I couldn't see her anywhere. I mean, obviously God used this lovely lady to be a blessing to me. But what if she was more than a blessing? What if she was an angel?