@veryconfused123,
Is she controlling or overly inquisitive?
Do her questions actually cause you to change your behaviour?
Have you talked to her directly and honestly about your feelings about all of her questions?
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It sounds like things aren't going well in her own life and that questioning/interfering in yours may be an effort to feel better. She needs help with that. You probably can't help/fix her but you can certainly let her know how you feel about all the questions. Let her know you don't like it. Refuse to answer or tell the truth - that is your call (my instinct would be to ignore the questions and/or redirect her).
Do you need to talk with her frequently? maybe put a limit on your contacts. block her on any social media you're on so she can't follow you around there.
She really does need to grow up and be more independent.
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If she'd done that to me/date, there would have been a very serious family discussion that evening/the next day.