。
She can't decide between getting a job or going to college.
Literal
She [topic-は] employment [or-か] university-advancement [or-か] decision [subject-が] cannot-settle.
AかBか presents two alternatives — 就職 (getting a job) or 大学進学 (going to college). 決心がつかない (can't make up one's mind) uses the set phrase 決心がつく where つく means 'to settle' or 'to be reached.' The が marks 決心 as the subject that can't settle. This is a very relatable dilemma for Japanese high school students facing the fork between employment and higher education.