I do think there is a difference now to when most of us married and had Mils. My Mil had difficulty sharing her only son but I 'killed her with kindness' until she accepted me. I put up with stuff from her I would not put up with from my own mother for the sake of DH. Unfortunately she didn't live long enough to become a grandmother. I don't think Dils these days put in that much effort to get on with their Mils.
Perhaps we should look at the situation in a wider sense. Does the Dil get on well with other people, other members of her own family? If not, perhaps it is her fault. If she prevents her husband having contact with his family and puts him a the position of 'them or me' it would appear to be her fault. However, if the Mil has problems with her family and has other Dils she doesn't get on with maybe she is at fault. If a Mil has other Dils she gets on well with there must be a question about the one she doesn't get on well with.
Gooseberry crop has disappeared
AIBU To Be So Annoyed at the Stupidity of This
Father's Day Sunday — nobody makes cards for this type of dad


" The mil here seems to be playing some irresponsible and ludicrous one upmanship telling the mother she is being overly precious with her child. It makes me wonder what sort of woman would wish to score points in such a potentially dangerous situation, aside from going against her dil wishes demonstrating a complete lack of respect. Pil should remember they are one step back, unless they have custody of the grandchildren. Respect of course works both ways and I have read equally shocking accounts of unkind behaviour inflicted on mils by their offsprings' partners.
.