The original thread for this was on Mumsnet.
The mother had to have an emergency c-section. The MIL was a doctor in the same hospital and used her work-access pass to let herself in to the operation theatre recovery area where visitors are not allowed and grabbed the baby without being invited by the parents. The original OP was also very distressed that because it was a secure/non-visitor area - the medical staff revealed the OP's private medical history that OP would not have wanted her MIL to know.
I think the MIL really overstepped and is lucky not to be facing disciplinary action for gatecrashing her DIL's private medical procedure
Retiring and living frugally in money from downsizing after years of stress
Have things improved in your 60s?
