Classy_Cosplayer

"...pair [or] do..." in case it wasn't clear [brackets] means changing a word in a quote or adding a word to a quote. also "...another..." is redundant

I think "...who's..." should be "whose"

"...serve[d]..." once again a problem of tenses

"...the dining [room]..."

"...probably haven't..." could be "probably because she hadn't" or "perhaps because she hadn't" or "for she hadn't"

"...the morning routine for the day..." could be shortened to "her morning routine" to make the sentence flow better.

first thoughts "...just in time..." should a comma after the phrase and not before or a semicolon after could work too. the comma's placement doesn't really work for me

"...and care for dinner..." could be rephrased to "without sparing a thought for dinner" or "without caring for dinner" or something to that effect. what it is now doesn't sound right.

"...have been..." can be completely removed, in the last sentence of this paragraph, to make the sentence flow smoother. double comas tend to omit or permit the omission of the text within them and the sentence can flow just fine, not always but it looks like here should be one of those cases.

it's a common problem when writing long sentences that you forget how they started and now that it's finished it's awkwardly worded, changing the word "...not..." to "it wasn't" makes "...[it wasn't] until the sun [set] and the study [became] pitch black..." sorry I just noticed the tenses were also off. you used present tense right before a past tense word. it just didn't feel right to me.