Well although its not ideal she is at least in good hands. Although the first prolapse was most likely caused by the large still born breech. The fact that she had 2 big lambs could also indicate that she was receiving high levels of nutrition particularly in the latter half of her pregnancy. Being overweight is a common factor in prolapsing ewes so it's worth considering whether that could be a contributing factor to prevent it happening to another ewe. Either way, whatever lead to the initial prolapsing has left her disposed to prolapsing again which is most often the case and your wiser for your experience.
I was so keen to ensure that one of my ewes who suffered with twin lamb syndrome last year was not a result of lack of feed that I feel I swung the other way this year and over fed my ewes ending up with post lamb ewes with more condition than I like to see at this time of year. I prefer them to be a bit leaner before the spring grass comes through.
In this instance there was no real harm done. The lambs were big and the ewes were all fine but I will scale back next year. So that's my lesson learned for this year.
But as I always say to my students...Even Goldilocks had to try 3 different types of porridge before she found one that was "just right" for her so honing your methods is all part of the process.