Hello 2belles
Sadly I can help. I have my own thread on OC, which you can read here if you wish, and also show it to your friend if you think it would be helpful.
The fluid build-up is called ascites and it is drained very easily and painlessly. Mine disappeared after 2 'drains' when I started chemo. I think your friend would be on Carboplatin and Taxol (aka Paclitaxel) as well as the Olaparib and Avastin?
I am on third-line treatment, which means two lots of previous chemo have kept things at bay, but not got rid of it. I'm now having 2 drugs, Cediranib and Olaparib) that I take in tablet form every day.
My advice when talking to your friend is to not ask her "what it all means." She will know how serious it is but won't want guesswork and melodrama. Stick to the practicalities - cooking meals, entertaining the DCs etc, and also just let her know you're there. Have coffee, send a text etc etc. Ask her what she would find useful and then do it. My DSis will insist on trying to manage me and tell me what she's going to do - which is effing annoying, tbh.
There is a trial called Octova, which is run out of The Churchill Hospital in Oxford, but is available across the country - if she is suitable.
Don't hesitate to ask me anything.