sounds to me like this person is trying to avoid every single normal feeling any person could have by medicating all of them at once. those are pretty much all physically addictive medications and they're all changing who she is. that combination of meds is plain dangerous... i know a woman just like you're describing. my ex was actually given a bottle stuffed full of pills by her--soma, anti-nausea, clonidine, oxy, robaxin, xanax, valium, percocet, codeine--and he also had his own dilaudid and ambien...then went and got some ativan to top it all off. this person falls asleep in her cereal. falls around her house. constantly slurs her words and looks wasted all the time. around her kids, no less.
i guess my short point is i would be worried about more than just the oxy.