To add to what's been said above, when you do talk to your chapter leadership, be eager to improve. Ask if they hold sister study hours, ask about academic scholarships offered and how your goal is to earn one, talk about your plans for better time management, and see if you can be paired with a buddy (whether it be a fellow chapter sister or an advisor) who can hold you accountable and ensure that you're on the right track for success.
Don't just go in with, "Pretty please let me stay!" ... or something to that effect
And you also need to be aware that while chapters will make exceptions for grade risks, you are expected to improve. If you're consistently falling below the minimum, the chapter can put you on probation and your membership may be terminated, even after you're initiated.