Hi there
@Mowerman124 and welcome to La Familia, the only way out is in a cell or in a box (or sometimes dead from Fentanyl)
Dark humor aside (I'm Jewish, it doesn't turn off), we need to establish some things.
Is this your SO's first experience with strong Opioids? Has she ever had an experience of withdrawal? If so, this changes things drastically. By the sound of your post, this is a pretty legitimate case of a non-drug user using Opioids for pain management. If this is not the case, let me know. We will figure this out for you one way or another, I promise you're in good hands here.
30mg Oxycodone (Percocet; Endocet; Oxycontin) is nothing to sneeze at, but it's definitely within reason for someone recovering from surgery. I don't believe her prescription is too high or anything like that is out of order.
Opioid dependence typically takes weeks or months of constant use for someone to develop a dependence and associated withdrawal syndrome that would really kick their ass. Basically, we shouldn't need to devise a whole protocol for getting her off. A strong person with normal disposition and mental health should be able to have a surgery, take this medication and stop taking it after a month.
It is likely that the medication withdrawal will cause some discomfort, though this is likely to be nothing more severe than a minor cold. You can expect some minor discomfort/anxiety, perhaps some mildly sore joints and your eyes and nose might water a bit. This type of thing should resolve within 72 hours at most given your SO's stated history and pathology.
You mention things like being active. This is encouraging for me to here, as you[re clearly people who care at least somewhat about your health and wellbeing.
Your SO should have some potentially mild cold/flu sy,ptoms but nothing that would require drastic life changes or medication. Simply withdraw the medication in a slow thoughtful manner.
If it were me, I would pick a 5 day period near the end of the medication. Over this 5 day period, you will reduce the dosage in small increments of 5mg per day or so until the end. On the last day, she should take 5mg Oxycodone and then try to make it without anything else. I wouldn't advise introducing other Opioids like Tramadol into the pitcture, as the frequency/duration of time on the medication is equally important to the dosage. You want to minimize the amount of time "on Opioids" as every day you take them drags you further into dependence.
Not all situations are ideal though. If she is still in pain and it's just not working, I would advise trying a similar 5 day taper using the Tramadol and see if that makes the process easier for her.
TL;DR this shouldn't be too difficult man. Ask us anything. No question or concern is not worthy of our time. Good luck. I hope to talk to you soon and sending out good vibes and love to your ailing withdrawal off of so little is no big deal. Just pick up some OTC nausea meds or if you two are really stressing over this, go to the doctor and ask for meds to counter withdrawal. I've been thru withdrawal several times and I found the worse part is stressing over how bad it might be. Keep busy or sleep.