I have a mare who red bagged, every time, with her colts. I have to say it is very hard work, emotionally, and even though I was there with her form before her labour starting, I still lost her first colt (often , if you are going to lose a foal, it will be the first as the mare does not get down to pushing quickly enough) I lost her second colt, who, again, I was there for from step one, he was a partial dummy (oxygen deprivation) and died as a yearling- I got him that far, but he collapsed and died after appearing normal for at least seven months. After that I camped out on her for all her births (this is one of my oldest mares and neither I nor, apparently my Vets actually knew what was happening)
Her fillies were fine, no birthing problems at all and, so far, it does not appear to be hereditary.
But I could not take the emotional stress any more and she was taken out of the gene pool and these days just spends her days annoying me (very dominant mare)
So I would say, one red bag, try again, if you had a live foal and can bear it.
Two red bags and I would advise you not to go on, it is too stressful, there is NOTHING you can do, unless the foal is actually presented and you can reach the forelegs but this is not always the case.
I must also say, it is possible, if the mare did not foal with you, that it was not a true red bag, so unless you are sure the people are correct, I might be inclined to have a go. Just be forewarned, that's all- it could end in tears.