Ellie, I received an e-mail asking me to buy a $300 Amazon card which you had tried to buy but your credit card declined. You asked me to purchase it for you, and that you would reimburse me. I recognized it as a scam immediately.
Here's the confusing part: Usually when I get an e-mail like this, I verify the e-mail. There is usually some slight variation in the e-mail address. Except this time there was not. It was your address, and entirely correct.
I am not sure how to advise you on this one. I'd probably talk to one of your kids (or even a grandchild!)
At the very least, I would change the password on your e-mail account.
Oddly enough, when I responded with "This is not Ellie," the message thread deleted immediately.
FYI, my friend.