Cashier interaction?

I was a my nearest thrift store and picked out like $25 worth of clothes but when I went to pay the total came out to $3. I got the receipt and is shown that I was only charged one book (I didn’t get a book). It seems I got a discount. The girl at the register was really pretty and looked around my age If not maybe older. She seemed shy speaking soft, no eye contact.
My thoughts was that she probably liked me I don't know.
I wanna go back and try to talk to her. I felt like I made a bad impression.
What do y’all think? Was the discount thing some sort of flirting?
Cashier interaction?
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