I had vitrectomies in both eyes when I was about your partner's age, although I only had one per eye. The post op positioning is not fun to say the least. You're stuck in a holding pattern just waiting to see if it will work. I know how hard it is. When I had my first one, my other eye was totally filled with blood too. I was basically 100% blind for 4 months.
When you are in that holding pattern, the only thing within your control is your attitude. You can't control how long the gas bubble hangs around (mine didn't pop per se, it gradually seeped away as my eye created new vitreous fluid, took a couple of months); because of that you can't control how long you are face down (with me it was until the bubble had dissipated enough that I could see the edge of it when I lifted my head upright, took 4 weeks the first time and 7 the second because the damage was so much more extensive); you can't control whether the laser repair works and fixes anything; the list goes on.
Until the waiting game is over, the only weapon you have in your arsenal is a positive attitude. I know it's hard. I know. I'm not sure how I arrived at this, but at some point I decided, "I've been better, but I will be again. I've also been worse, and I may be again some day. Whatever happens, it's going to be okay. Even if it's not."
I'm still blind in the second eye to this day, 13 years later--as I mentioned, the damage to that retina was too far gone by the time they were able to get in there. But my good eye is 20/30 with my glasses--I'm legal to drive in my state.
When ready, I encourage you and your partner to explore a web forum that is a lot like this, for people with vision issues. It's called losteye.com They also have a Facebook group called LostEye. I don't want that to sound like I'm giving up on your partner's eye or that you should either--several people there have suffered detached retinas and multiple vitrectomies to the same eye, and would be a good resource for you.
Hang in there. It's going to be okay. It always will.