biscuit, in this bad news, it is good news that she is self aware of how she's done, so it is very positive for Cardiff. Is QB MMI or panel? I really believe that gut instinct plays a great role too so if she was hopeful about Nottingham, then it is highly likely the invite is on its way and when it does, she will have had the experience of the others to put all into this one.
I also agree about the no Med School talk. I don't know about you mums, but I do find it hard to be the 'best mum' around DD at the moment, as on one hand, I am the only one she can talk about it all and rely on for info and support, but on the other hand, there is that teenager/young adult in her who I know would want to shout 'but off mum and led me deal with this on my own, you don't need to repeat/go on what I already know'! So I try to strike in the middle and so far, I haven't been fired yet! In the end, it has helped that she's started driving as it gives another reason for conversation that is a distraction to Med school and studying!
Somerset, it is hard to gauge how well they do when they say it went well because some interviews are easier than others, so all will either find it hard to easy, but still better to wait feeling positive!