My DD's in-laws are lovely people, and my DD is lucky to have them. But even they over-stepped the mark when DGS was born - illustrating, I think, that even nice, well-meaning people can get it wrong.
DD had a really difficult and long labour, followed by a section, and she was in physical and emotional bits. The in-laws came to the hospital on day 3 and stayed for more than 2 and a half hours....far, far too long. Poor DD was struggling to bf, struggling with drips, struggling to the loo, struggling to keep in the tears (she was ok weeping with me, but it's different with your in-laws). In the end, I had to take SIL to one side, and get him to boot them out.
Now, they might have thought 'how rude' though if they did, they did not show it.
It was several weeks before DD was able to cope with visitors who stayed more than 30 mins. It's hard holding it together in front of others. It is better with your own mum, usually.
I wonder if jeanie's DIL was just sick of visitors and wanted to be on her own with her baby? The baby may well have needed feeding, and it seems unkind to think of this as a 'complete lie'. Many mums don't want to leave feeding until the baby actually cries, but respond to earlier feeding cues. Whatever - the mum has a right to think what she thinks!