I have not had this happen to me, or know of anyone it did happen to, but I wanted to offer my 2 cents. Where is her swelling? Has she had an echocardiogram recently to check on the function of her heart muscle? Did she have any issues with swelling prior to her pregnancy? In my mind there is obviously something wrong, and I have never seen a case of severe chronic swelling that comes from diet and climate alone (although I am not a physician). It does seem as though there is a piece of the puzzle missing, and I would encourage your daughter to be proactive about her care until they can figure out what is going on. One of the other ladies may be able to shed some light on the lasting post-partum symptoms following pre-eclampsia and eclampsia as I am not too terribly familiar with post-partum symptoms.
Miscarriage at 8 weeks- 5/09
Abby born 37 weeks 4 days on 3/25/10 due to PIH and IUGR- 5 lbs 0.5 oz
Chemical Pregnancy lost at 5.5 weeks- 3/11
Pregnant again due Sept. 3 (now chronic hypertensive and on Labetalol)