I think it is terrible that she blocked you. Cowardly and disrespectful. Why would you want someone like that!
Do not contact anyone she knows and do not try to reach out to her.
I think that she was already having doubts when the mood shifted. When you had the open convo and said you should bring it to a clise, was her excuse to end things.
You do not need people like this in your life. You only saw her over a period of a month (in person). That's a blip. Move on from this girl!