If you've got injectable Combivit, a jag of that would do her no harm at all. And given you don't know if she's passed her afterbirth, and have had a poke around inside, you might want to give her some a/bs too.
Regarding the lamb, just standing sounds hungry - but you say his tummy is rounded? She maybe butted him away at some point, and he is genuinely dazed? And/or, if he was en route for a long time, he may had had some lack of oxygen to the brain. If so, he may come right, or may always be a bit dopey.