Not really much balance grumpy!
Pick your course well- means likely relocation. Voluntary work in the summer, means less than no money for the 4 years of degree.
I also have a PhD and I have a really interesting (quite senior) job in a biotech company discovering new cancer therapies. Quite well paid. I am now mid 40s - have been working for nearly 20 years since my PhD, 12 years in academic research and several in Industry
You have a degree, a PhD, 20 years of post doc experience. O/p will be nearly 80 before she gets to where you are now- she'll be nearly 60 before she starts earning at all.
Would you start your career path over again now, at 40?
I suppose it depends on o/p's finances. If she can afford 10 years with no income (and possibly uni fees to pay on top), and entry level pay for the rest of her working life, great. If she has mortgages to pay, children to support, bills to service, it's not realistic.