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Final update: We got it fixed!
The real problem was a bad PCM. I bought it on Ebay for $75, and because this is a CVPE and has no PATS, I didn't have to get it reprogrammed. Plugged the new one in, and no more O2 codes. Unfortunately, it started throwing a catalytic converter code instead. Because she had let it go so long, the bad PCM had been doing a poor job managing the engine, and had completely clogged one of the CC's. We replaced it, and now everything is running smooth! Thanks to everyone that helped me figure this one out, I was really baffled there for a while!
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