Now

This word is used in English to introduce a new part of the story and background information about Sarai. (See: rc://en/ta/man/translate/writing-background)

female servant

"slave-girl." This type of slave would serve the woman of the household.

"from giving birth to children"

"I will build my family through her"

"Abram did what Sarai said"

"she despised her mistress" or "she thought that she was more valuable than her mistress"

Here this refers to Sarai. A mistress has authority over her slave. AT: "her owner" or "Sarai"