She is a Capricorn girl, very beautiful! The relationship is ok! However, she often doesn't return my messages. She feels cold to me, but sometimes she tells me a lot. ...

Capricorn is a very cold and slow-heating character. She can tell you a lot, which means that she has classified you as a friend. Capricorn doesn't take the initiative or express his feelings directly. According to your description, I believe she must be interested in you.