please help

[frindle]

Hello. I am really confused what the underlined parts mean in this context.
(Sorry, it's a long context. It's a retelling of Cinderella.)
1. looking for all anyone would know: I don't quite follow this part in this context.
2. as this had become, when the Stepfather brought them to it:
what do "this/them/it" mean here?

He could, and he did, remember how much he had to thank the well-born widow for. For example, his house would never have opened it door to one of the King's footmen, who presented a paper sealed with the King's royal signet, had he had not married their mother. Yetiffe took the folded paper from the stepsister - who had answered the knock on the door, looking for all anyone would know like one of the servants of the house. Which was a blessing, because her manner was too modest for a daughter of such a house as this had become, when the Stepfather brought them to it. If she had been a genuine domestic servant she couldn't have done better.

[5jj]

He could, and he did, remember how much he had to thank the well-born widow for. [...] Yetiffe took the folded paper from the stepsister - who had answered the knock on the door, looking for all anyone would know (appearing/seeming to be, as far as one could judge [from her appearance]) like one of the servants of the house. Which was a blessing, because her manner was too modest for a daughter of such a house as this (house) had become, when the Stepfather brought them (the stepdaughters and their mother) to it (the house). [/QUOTE]

[frindle]

Thank you very much.
However, I still don't understand as this (house) become mean in this context.
And what does "Which" refer to?
Thank you.


Which was a blessing, because her manner was too modest for a daughter of such a house as this (house) had become, when the Stepfather brought them to it.

[5jj]

Once the widow and her daughters had entered the house, it became much grander. I don't know whether Yetiffe spent more money on it, the women had tidied up its appearance, or Yetife felt that their mere presence transformed it into something grander.

'Which' refers to the fact of his stepdaughter appearing to be a servant.

[frindle]

Thanks again