March
Can't believe this thread is still going!
I saw my midwife today. She pretty much set out the rules the niece is talking about. The 2 week thing is to establish breastfeeding and for mum to recover from giving birth in the hospital/covid conditions.
Apparently the breastfeeding rate is at a low and you're twice more likely to get postnatal depression what with everything going on..
Can't think why 
So new moms are being given these guidelines by the medical professional and not just making them up to hurt elder generations by disallowing contact before 2 weeks.
As I have said many times in the past, when we know better we do better. Doesn't matter how things used to be done. Each generation learns new way to do thing that are best for the baby.
As for the original topic of receiving this by text instead of over the phone, I still believe that, based on the OP's updates, the mother was not listening to the boundaries of the daughter, which is why the daughter felt it necessary to text. If I had received it from my daughter I would wonder what I had done to make her feel like she could not talk to me. At the same time, I would not be surprised because my kids (Gen Z) HATE talking on the phone.
The rest of the thread is a normal meandering conversation. I would be surprised if it did not happen.