This girl is getting me stressed out..?

alrite ive been talkin to this girl for a month a half now and ever since we started talkin there was an immediate connection....at 1st we only talked online then i asked for her # and we started talkin on the phone,in my estimation the girl is beautiful, smart, understanding but her problem is shes secretive and a bit shy...ive gotten so into her that i stopped talkin to other girls and talk only to her now....whenever we talk on the phone she always whines and giggles when i talk to her..she talk to only a couple pf other guys on the phone (maybe not now) but she said no 1 makes her whine and giggle and she does not understand why she does it....i opened up to her, telling her about my personal life, family issues, likes/dislikes, opinions of diff things in life....but damn, i cant get anything out of this girl...i truly sense that she has alot to tell me but shes scared to and she admitted to that herself....when she tells me something and i dont catch it and ask her "what did you say"?, she goes "Nothing...".....a few days ago after talking on the phone and making her cry after talking about my family life (she is estranged from her parents and lives with her friend at the moment)...that same nite at 11:11 she messaged me saying "make a wish"....i told her to make 1 herself and she said she already did and doubts its gonna happen...i tease her saying, ill make that wish come true and she says pshhhh, dont act like you know everything...she follows by saying i have a secret to tell you later on in life...i tell her you can tell me now..she says no its for later...i ask for a hint, asking her how many words does this secret consist of? she replies 3...and i get astounded.just rite now we were on the phone and i revisit what she said to me a few days ago, asking what did you wanna tell me a few days ago..she starts whining saying, no its embarassing, i tell her i want an open relationship with her but i cant do that if shes gonna hide things from me...she says she cant do it and that she has to go and i could swear i heard tears...i tell her ok, take care of yourself and she hangs up..this girl is overwhelming me with her games...she circles my head most times in school and i couldent sleep last nite cause of her...what do i do to drive this girl to be more expressive with me and tell me those 3 words...i know what they are but i wanna hear her say it so that can enhance our relationship.....