Hi ARM---It is thought that omega 3's reduce inflammation, which might be a factor in developing preeclampsia. I believe that we might need to supplement with 3's, as our American diet and propensity for processed foods gives us too much omega 6 fatty acids. An imbalance of those fats in the body also leads to inflammation. There are also many high quality plant-based sources of omega 3's, like ground flax seed.
I can't offer any help with the risks of PE again in a second pregnancy, but I'm sure that you are at a higher risk. I could offer you some information on omega 3's, ways to reduce inflammation and oxidative stress in the body (and when pregnant, you create lots more of both). I can also share research on how a whole food, research based supplement, made from 15 different fruits and veggies, and the bran of 2 grains, supports a healthy pregnancy (and every cell in the body, baby too!) and greatly reduces the risk of preeclampsia.
If you would like to know more, I would be honored to share with you. Please feel free to contact me. It is my goal and passion to help others learn why our nutrition is so important, and then how to optimize our health. We can chat for a bit to see if it makes sense to you. Good luck with your research and hope to hear from you soon. In health, D.