Exactly. I don't think this erases oppression at all, but people often either use it that way or use oppression to erase agency.

It's probable. I just think if someone else did visit, they might be an influence somehow. Fanny came out before Maria's disgrace and Tom's illness. That was related to the Crawfords, if I remember it right, so I think it's possible for someone else to trigger it too. But the default situation means your suggestion is the most likely.