Having problems need advice !

I just had my baby girl April 1 at 33weeks and 3days due to preeclampsia I have lots of fluid in my face, stomach,thighs,legs and feet .. she is in nicu her weight is 4lbs 11 oz ..I have been trying to pump my breast milk and nothings coming out they are feeding her through a tube what can I do to produce faster I tried drinking lots of water but still nothing it's it because I have preeclampsia?