@dreamer30 I'm ebf at 5 months, but definitely had issues with supply early on after a rough 48 hour induction and complications for me and baby which meant I couldn't feed her, be with her, or even pump for 8 hours after birth.
I supplemented until she was... 6 weeks old maybe? I struggled to eat, drink and sleep for about a week or two Pp. No appetite, night terrors, insomnia, plus the hormonal crash and side effects from all the hospital meds. I was really backed up and some prune juice and... I forget what it's called, the medicine that dissolves clear in water that helps you poop? Helped a lot, and I was able to start eating better again.
2 oz for a power pump is not bad this early on! I power pumped daily for a week to help get my supply up, and I would often get half an ounce or less, but it did help. I made sure to drink a gallon of water every day and for a while ate oatmeal to help. Never did any of the special supplements like fenugreek or anything. I pumped for 15-20 minutes after most daytime feeds. I fed as often as baby wanted, but once a day either my mom, MIL or husband would take baby for 4 hours while I slept and feed her donor milk if she needed it. I think the rest helped more than one fewer breastfeeding sessions a day hurt.
You are doing good. Even if you are supplementing baby is still getting the benefits of breastfeeding. Even if you have to go full formula (but if your wife is pumping 2 oz with a power pump 8 days postpartum I don't think you'll have to) that is not a moral failing. Sometimes bodies don't body how we want them to body. And no one prepared me for the extra obstacles to breastfeeding I would have with an induced labor.
One note - I would not still be breastfeeding if it wasn't for my husband. He pushed me not to give up and reminded me of all the benefits of breastfeeding and how he wanted our daughter to have them. And at times I HATED him for it, no joke. I just wanted to switch to formula and sleep for eight hours (or days) straight.
His insistence and support got us here to a light but healthy ebf 5 month old. But also I sometimes feel like he pushed a little too hard and I still resent it. I guess what I'm saying is your support here is critical, but it's a balance. Since she's the one breastfeeding and recovering from surgery, she is working harder than you. If she decides she's done, that's up to her. You can encourage, you can offer the option of combo feeding to whatever degree is appropriate. But she decides how much and how long to breastfeed.