Did she? I see your point, but I take her as very confused.
Yes, she did: "I don't even know if I will end up working in that industry as I would like to be a stay at home mum until all my future children are in school".
Which can be a valid choice. Nowadays, fortunately, both parents are free to pursue a career if they want to, but a desire not to and focus full-time on raising children is legitimate too.
The only problem, I agree with others here, is that you never know what might happen. Whether your partner will always be successful enough in their career to provide for all of you. Not to mention that they might suddenly get laid off and have trouble finding any new work; or get in an accident, or ill, or worse.. Or whether the relationship might not, after all, fail in one way or another - you never know, no matter how determined you are, and you certainly can't really know after just one year together... So having access to a plan B is always good. And a degree can help with that, even if it doesn't guarantee anything. A couple of years of work experience would be better still (esp in combination) - and, at least in the West, 24 is still plenty young enough to do that first.