Welcome Grannypiggy
I have three daughters who each have 2 children and, w hen things like this happened, I would offer vague advice along the lines of 'Well, I had/didn't have that and, in the old days the advice was........, but the advice will have changed so I'd leave it a couple of days and if you are still worried, ring your midwife'
Is she with the baby's father? If so, he should be her first port of call now, not her mum.
It's a similar thing when the babies and children arrive, things have changed so much that it it better not to give too much advice - it will almost certainly be wrong!!
Having babies and giving birth is the most natural thing in the world and most go pregnancies go really well so the is, probably, nothing at all to worry about. As for doing to much, consider how she will cope with number one if she has any more.
Tegan, NCTs are a real mixed bag aren't they? DD1 made really good friends in her group. They are still friends and go on holiday together etc. DD2 and DD3 didn't gel with anyone on their groups.