Then if she's not very interested in meeting up for a coffee she doesn't want to be your friend and no matter what you say to her to take back your bad behaviour, it's not going to change her original stance of not wanting to meet you for coffee.
To keep trying is called harassment and stalking and if she's saving your missives you can get charged with both of those offenses Mmm'kay?
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion