If she is giving you enough information about herself that you are able to conclude you would 'connect' outside the rooms, then it's no longer effective therapy for you - therapy is about YOU - her needs, wishes, desires, thoughts, feelings aren't the focus.
So again - either she is talking a lot about herself and what SHE thinks and feels (enough for you to 'know' she would be compatible for you in a relationship) OR she isn't, and you just think you know enough about her to feel you would 'connect'.