Thank you for your good advice, UptheChimney. My dd is coping reasonably well, but missing her home friends who have all dispersed to uni. I think that some of the problems come from suddenly realising that adult life is a lot more isolating then being with the school and home friends you have known for years and feel safe with. It's the only time in your life when you have such a stable group of mates. All the uni people are new, you don't know them, you don't know who you can trust, just because you don't really know them. Think this might be one factor in feeling unsettled, lost and homesick.
I also think it makes you feel insecure because you don't know the town, campus, people, work, course, you name it .... If I cast my mind back to moving house to another area it was such darned hard work to find things because I literally didn't know anything. And if you have never lived away from home before on top of all that, it is tough. I tell my dd to give herself a chance - all the dcs are doing brilliantly coping from day to day.
Bless Mumsnet for providing a forum where us parents can be honest about how we feel and how our children are feeling. I am totally fed up with this myth that university is fantastic and wonderful from the word go. It is just putting more pressure on all of us. If you think about it, what adult who went to a new workplace or area would find it marvellous instantly? If you are very lucky, well bully for you, but for the majority it isn't that simple and it takes time.
Thanks for listening, folks. Hope all the dcs are settling down a bit more.