。
It was either go or stay for her.
Literal
She [topic-は] go [or-か] stay [or-か] one-or-the-other was.
The disjunction か...か...どちらか ('either X or Y') is built from the question particle か repeated on each option. どちらか ('either one') wraps it as a noun. The structure presents a binary forced-choice — exactly two options, and the speaker reports the constraint as past tense (だった), framing it as a moment of pressure or decision already past. Common variant: ~か~かのどちらか, with の inserting a soft genitive nominalization.