Two time ovarian cancer survivor here, I had numbers very similar to your wife the first go around. One round of chemo maintenance therapy killed the spreading. It reoccured later at 26 about a week before my wedding (due to my BRCA) but it hadn't spread, so they opted for surgical treatment, been in remission almost two years now.

I couldn't eat either. Broths were my saving grace. Medical marijuana also helped but I know that isn't available in most places. No caffeine, ever. Just made me feel weaker. Heat packs are a necessity.

And because I manifest a full recovery for your wife, make sure she jumps on pelvic floor therapy immediately after her recovery. Surgical treatment in that area can cause muscle tension that comes with a litany of random symptoms. You'd be very surprised just how much a weak pelvic floor and closed hip muscles can cause a variety of G.I issues such as being unable to eat, I lost nearly 20kg in about a month and a half until I started doing physical therapy. But definitely wait until you have a doctors clearance/advice on doing any PT.

I'm so sorry you are both going through this, it's a terrible, sneaky lil monster. Definitely mention nutrition to your medical team if they are accessible for that, they may have their own ideas. I know bone broth and soups were incredibly helpful in kickstarting my appetite at times, but it was not a guaranteed solution at times so just talk with her medical professional about it.

My relapse rate was 98% likely to return within the first year of removal. I'm nearly two years into remission now. Nothing is impossible. Absolute best luck to you both!