S.T.
Ohh, P., I am so very sorry for your loss. I experienced PROM with my daughter at 32 weeks, but luckily she survived. I then experienced PROM two years later when I was pregnant with fraternal twins, and I lost the twins at 20 weeks.
Sadly, the first responder below is wrong. Most OBs sort of treat PROM as an anomaly, something that just happens randomly, and they will not treat you with more care in a subsequent pregnancy (or maybe that was just the Baylor practice I was with, Women's Health Alliance). Even two years older (and I was 39), pregnant with twins instead of a singleton, they were not worried about the possibility of a future occurrence of PROM and took no steps to minimize the chances of it happening again.
The good news is, there are some OBs out there who will treat PROM seriously. My current OB/Gyn, Dr. Gregory Chapman at Presby, said if I ever did get pregnant again (at 42? Haaaa!), he would absolutely schedule a cerclage for 12-13 weeks. Based on research I did after losing the twins, early cerclage can greatly increase your chance of carrying a post-PROM pregnancy to term, as do things such as 17P shots, bedrest, and more careful and more frequent monitoring. Here is a website with more information about PROM: http://www.kanalen.org/prom/ I learned more from that website than I ever did from my former OB, if that gives you any idea of how helpful the website is (or how unhelpful the former OB was). The good news is that there are success stories on the website from ladies who suffered losses and went on to have living babies. It can and does happen.
Again, I am so very sorry for your loss. I know you are aching for your sweet daughter. I can't tell you how many people I have met who suffered from a PROM loss around 20-21 weeks. It seems to be a crucial point in the pregnancy for some reason, and there is nothing more heartbreaking.
Oh, and I wanted to add, I also think MEND is a great group. It helps so much to be around other people who understand how devastating it is to lose a baby and who won't say well-meaning, but horribly hurtful, things.