I have an idea, I think if she sees how Im not alone on this, she will feel better. Can you guys tell her its okay? Ill tell her to read this thread.
What!? Don't let her read this thread, then she'll get even more suspicious! If she doesn't believe you after seeing the receipt, then you can't do anything else to convince her short of dragging her to the store and showing her the security camera footage showing you buying it.