Maybe she did.
Yes, she should have....but she was probably too upset, went running home to the arms of her daddy, and he exploded with outrage at the abuse of his 'baby'.
What Red Lobster should've done was see the violation for what it was, and say to the girl; "Company policy is that you don't post company receipts online or make them public...but in your case we completely understand the emotion involved and will be overlooking the breach of our policy.
Dear, take a few days off on full pay...to recover from your shock and trauma...that was a terrible thing for someone to do to you".
And what are they going to say when it comes out that she wrote the note herself? Then posted it on Facebook herself (not her father) and ruined the life of yet another innocent man? I'm getting kind of sick of these people that blame everyone else for hate crimes when it's clear they are the ones with the hatred. She's already made more than $10,000 of the deal, wonder if they'll be able to make her give it back?
What the company would say then is that they took the girl's claim at face value to be honest and true, and acted in her best welfare.
For which most people would applaud them.
If at a later time what the girl claimed to be true was proven to be a total lie...then they would be entitled to sack her...and likely be applauded by most people for doing so.
The cops could interview the girl's father, and tell him what the go is...that if his daughter has lied and owns up now she could claim "I did wrong, but I was mixed up in the head at that time, and the voices told me to do it", "I humbly apologise"...and maybe not be charged by the cops...but if she keeps on with her claim and it's proven to be a lie she could be charged with a crime and jailed.
They could also ask him if he posted the receipt on Facebook...telling him that they want the absolute truth.