She knows fully fine well who’s sent what, no way is anybody going to send something without a notification if who it’s from, never!I wonder about the stuff she receives but "forgets" who sent it to her. The whole "send me a message" bit? I'm assuming she gets thousands of messages daily. How would she see the one from whoever sent her an item. Either the business attached their details in the package, or they deliberately didn't because they didn't want to attract attention or just wanted to give her a gift. Is this a way to negotiate a shout out deal? Laziness? I don't know.
It’s just another excuse not to thank. there is no excuse, it’s basic manners, I would hope she has been brought up with.