(1) probably represents the mentality of wanting to establish a closer relationship with others, or the mentality of wanting someone to talk to.
(2) The girl who calls you is likely to subconsciously symbolize another you. What message does the subconscious want to convey to you? This may mean that you are clearing your mind.
(3) If you know this girl, she usually represents someone who can heal the wounds in your heart or answer your questions.
Good luck!