Yes. I came to say similar. Read a different humanities subject but the idea that you'd actually get through the entire reading list given each week or each term is fanciful unless you do absolutely nothing else and, even then, burn the midnight oil consistently. Not a recipe for a happy life.
I think at her stage of things I still thought I was going to get detention or kicked out if I turned up to a tutorial saying, "I only managed to read x, y & z this week and didn't really know what to say in my essay - can we talk about why?" She'll still be trying to impress them and justify her place rather than extracting all she can from the tutors for her own benefit!
It ends up being an exercise in prioritisation and understanding what's important and what's a nice to have (perhaps based on your essay focus that week), which has been very good training for the workplace in my experience (though it took me an incredibly long time to learn to lesson for someone who's supposedly reasonably bright!)
I also echo the bit about a lack of active teaching. In many ways quite nice as the focus is on exploring and discussing whatever sparks your interest, but quite alarming for those of us who appreciate a bit more structure.
As others have mentioned, there's a plethora of support in college and she can certainly email any academic office in the search for her personal tutor and they should manage to get her top the person with the answer. If in doubt about where to start, start with a generic college email address or even the porters! And when she's found them, she should feel free to speak to them about her concerns for reassurance and a not of academic guidance.
It sounds like her joint honours schools have been very irritatingly chaotic, unfortunately, so hopefully next term will be better.
If not, I also knew several people who stopped down to single honours after a couple of terms of insane overwork. There's no shame in that either if she eventually decides that would be better.
Poor thing. Please tell her not to worry and to really enjoy the experience, knowing she's not going to be perfect - not least because there's no such thing at this stage. If I could do it all again, I would (because it was great fun), but I'd take my own advice and worry less! I expect I'd therefore actually be more productive...!