id cut her loose, if shes back with that guy, shes just gonna waste your time and string you along, i cant think of anything that could do in a day that would sway her opinion.
if you had more time i would say, think about what her bf is like and become the exact opposite of that, find out what she is lacking in her life and provide it. for example does she need someone to listen? or does she lack excitement?
let her see you with other chicks if all possible
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