OP, I think you need to trust your daughter’s instincts. Wanting to stay with your baby is the most natural thing in the world. However, nothing is fixed in stone.
I was on the 11 plus “circuit” with my DD earlier this year and there was one very interesting talk from a head at a top London Girls” independent school. She said that the main skill we need to be teaching these days is adaptability. A levels are too rigid. These days, the average graduate will change jobs / career path NINE times in the course of their life. It’s not enough any more to train in a “profession” and expect to stick to one career path. Many jobs will become obsolete. Also, the typical 9-5 will become a thing if the past as more people are able to work from home or at times that fit around childcare. She expects that at least half her students will start up their own business at some point - probably in something nobody has even thought of yet. In other words, the rate of technological and social change over the coming decades will be unprecedented and young people need to be able to adapt.
There is nothing to stop your daughter doing other qualifications or a Masters while she’s at home.
I left work when I was 29, so a little older than her. I had spent a year travelling after uni and also had an MA and a few years experience under my belt, but I knew once the DC came along that that being with them was the most important to factor for me. It was irrelevant what anyone else thought I “should” be doing. You only live once. DH was if the same mindset. Yes his career has rocketed, but it’s hardly a competition and we all benefit from that lifestyle. Even if we split, I’d still be better off than if I’d been working all these years. Sometimes it just makes sense.
Now I’m looking to return to work on my own terms in my 40s. Why not? If your DD is having a baby now at 24 and wants to have several, there’s nothing whatsoever to stop her returning to work in her thirties. Maybe she’ll start up her own business? Maybe she’ll do relevant training during that time? The world can be her oyster basically.
Plus, she’ll only be 40 when her eldest is doing GCSEs and maybe 50 when they’ve all left home. She’ll have the energy to pursue whatever she wants then - it could be a whole new lease of life for her.
Good for her in that she has the confidence to trust her instincts. Good for her that she’s found a decent man who shares her outlook. Sounds like they’ll both be fine to me. I certainly have no regrets and, as I say, nothing is ever fixed in stone.