Since the transaction went through FaceBook, eBay policies do not apply. It will have to go through Paypal and yes she does have some recourse.
flying_narwhal is correct that Paypal's new deadline for opening a case is now 180 days, not 45 anymore. I would have her start the dispute process. Once a dispute has been opened, they will have 20 days to decide on a resolution. If it can’t be resolved, she can escalate the dispute to a claim. I would have her screen cap any or all of their communications, she may need them to prove that there was a missing piece.
I would also suggest that if she has any more questions to call Paypal directly. They are really helpful when it comes to situations like this.