Some women of her generation basically feel like women are there to care for children and elderly people and have no right to a life of their own. She can think that all she likes but you don't have to agree with her.
It is a far-from-uncommon outlook for people of her generation, to see it as a duty and a 'right' that they can go on to expect from their own daughters - but what do they do if they don't have children or if they outlive their children? I wonder if they feel the same if they only have sons, who maybe don't go on to marry, so there aren't even any DILs to rope in.
It was maybe more understandable in a time when, although expected to look after the young and the old, women were released from the responsibility of having to financially support the family. Not great for personal freedom and equal rights, but at least you weren't continually pulled both ways - family and paid employment.
Of course, it's lovely to be there and visit and help out your parents as they get older, where feasible, but having the full-time responsibility of caring for them is just not sustainable, especially as it often falls when you have young children yourself.
Does anybody else remember the thread from a little while ago where the OP's MIL made it abundantly clear to her adult children that, as she had made sacrifices and brought them up as children, she now expected a generous 'salary' in return from them for the rest of her life? It wasn't even so she could pay her rent or gas and electricity bills etc - she liked the finer things in life and expected to be 'paid' so that she could buy herself all of the lovely treats she believed she deserved, having earned them by being a mother of once-young children.
Meanwhile, OP's own children were having to go without anything more than the basics, as hundreds of pounds of their family money was being claimed and taken away as soon as it was earned.
I agree with a PP about Wanted Down Under, though. Although you want your children to grow up and make their own way in the world, without standing in their way, I would be devastated if my son eventually decided to emigrate to Australia or New Zealand. Even if you do enjoy good health and have plenty of money to pay for air fares, you aren't realistically going to see each other that often. The likelihood is that, whilst time is on your side and health and funds allow, you'll have to factor your very limited amount of annual leave into the mix; and when you're retired and finally have the free time, the money and good health will soon start to dry up.
Forgetting any 'caring' needs, but just from a pov of family spending time together, if you live in the same country (well, a relatively small country like the UK at least), you might see each other once a week (if local), once every month or so (if further afield), maybe a few times a year (if a lot further away). If you stop and think about things realistically, with one side in Europe and the other in the Antipodes, you can probably count on the fingers of both (maybe even one) hands how many more times you're going to see them before you die. You'll never really get to know your grandchildren well (unless they're already born and significantly older before they leave).
Seeing the mutual joy between my DS and his two living DGPs of having each other in their lives, and then thinking about the other two who died long before he was born, I can't personally see why anybody would actively choose that separation - but each to their own, and I know not everybody is fortunate enough to have a close loving family.