I think you did fine. I agree with the other posters, I do not necessarily turn the Pitocin off first, the goal is to get delivered, I acess the whole situation and try the interventions you did.
I have been an L&D nurse for a long time, but not so much postpartum, last week we had to keep a c section, twins, mom in L&d for 24 hours because of bleeding. I had only that patient and she kept me completely busy for 8 hours! And she wasn't on Mag! I had to give blood, teach pumping, manual expression, try to get 2 near term babies on, try to get her up, after she got the blood and could sit up without fainting, etc, etc, etc.
I agree that newbies should take the difficult pts, that's how you learn, but your assignment was too much and you should have gotten more help from your co workers. JMHO