I was a few years older than the majority of the people on my degree course, and even 20 years ago, most of the 18 and 19 year olds were only there because their parents had insisted they go to university. Consequently, most of them chose to do "soft" degree courses just to get their parents off their backs. I don't think many 18 year olds do have any idea of what they want to do with the rest of their lives, to be honest. How could they? In one way, why should they? The average 18 year old has no real concept of their ever being even just 10 years older - the sheer hard slog of being an adult. They should be at university to study and work hard, yes; of course - but it's more about the experience, and... I think... a last chance to be young and daft before you have no other option but to grow up and enter the world as a socially responsible individual, get a proper job, perhaps marry and have children.
At least your daughter's being honest with you, OP. Although Zoology isn't an easy ride, unless they've changed the course drastically in the last 25 years. An old school friend chose to do it for her degree, thinking it was a "soft" option (I seem to remember her thinking that she'd simply be visiting a load of zoos to watch the animals and comment verbally on their behaviour - whereas she spent more time being lectured by Zoologists on animal psychology, physiology, and in cramped hides). She admitted a while later that it had been "a bloody hard slog" and that she should have studied English instead.
Out of my little group of friends at university, I'm the only one who still works in the field we studied (archaeology) - but I suspect that's because I was three years older than they were, had already worked in the field full-time for those three "missing" years, and was a parent who needed the degree to be able to be taken seriously and work in a higher position in the field, to provide for my family. We have a lot of NHS workers, for instance, a few accountants, one lawyer, some bankers (nepotism, I think, if I remember rightly), and two teachers - one senior school English teacher and one primary school level, so a little of every subject bar archaeology! All with a "soft" degree (it really wasn't) in practical archaeology.
Surely you'd prefer that your child go to university, to get a degree, which will enable them to get the better paid jobs later on, because they actually want to... rather than just because their parents want them to do so? My daughter's just about to start her 3rd year, and is at university because she wanted to get the degree in order to be able to work in the industry she's dreamed of being gainfully employed in for most of her life - but even now, 20 years after I first experienced this, most of her peers at university are very open about doing a "soft" degree because their parents want them there, "for the experience", than because they actually know what they want to do for the rest of their employable lives. But a degree will elevate them in an employer's eyes, at interview stage, unfortunately. That's not changed much over the years, either, even though it ought to have.