I know this is mostly covered in the sidebar but the situation seems a bit ambiguous at the moment.

Been talking to this girl I know not too long. Had a couple of hangouts, she's really interested and we've made out a couple of times. However, two times she's flaked on plans; one that i made and one that she made. Other than this, she's initiated most of these hangouts and still shows a lot of interest. After the first flake i ghosted for some time, initiated later we had a quick hangout one day and all was well.

This last time, she plans a hangout then flakes last minute for an arrangement she forgot about. I didn't reply and made other plans now don't plan on communicating for some time.

In summary, when is the proper time to hard next? She still shows interest and hasn't really been disrespectful to the point that I'd cut her off completely. Also, isn't a bad friend to have as she's not a total bore.