How can they afford the upkeep and taxes on that manor if they are poor... Why is the butler still with them if they can't pay him?
It doesn't seem like it's been THAT long since the condemnation, so I doubt the expense has racked up that much, especially if they've sold off items/laid off workers to reduce expense.
The old butler type tends to work out of loyalty rather than benefits, so he probably chose to stay even with no pay.
Though seeing this now I want one where Villainess get sent to monastery far away to reflect...then she did.
By being away from noble societal expectations, she was able to find some peace and enjoyed it.
Whether it ends with her finding a new dude to chill with or remains a nun is fine.