Girls, What should I do to convince her to stay forever (haha but fr please help )?

Short story we had dating for 9 month.. she is VERY sensitive persons but she is loving too when she is normal/okay. Small mistake but its very deep and big to her.. now she gave up and declare herself single.. she dont want anything with me anymore.. she upset when i bringup about my ex. How i convince her to get back to me? should i buy her gift and give it her home? She tired listen my bag to her.
Girls, What should I do to convince her to stay forever (haha but fr please help )?
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