Ah righto, that makes sense I can imagine a young pup taking off when they see the other dogs running around, and the sheep would be all new and exciting!

It's great that she's already learnt to stay. If she's picking up things well without needing food treats I probably wouldn't introduce them. Speaking of food, one of the first things I'd teach her is o stay and not eat until you let her, especially if she's going to be around your kids. If she's going to be on a lead I'd start getting her used to it, and walking right by your side until she will walk right there without the lead on.