Shy Girlfriend?

Im 15 and shes 16 And been goin out for an year and 2 months but she wont neva talk to me on the phone and im kind of thinking she that way in person to the only way we talk is if her bro gets on the phone and tell her things i say or we talk on Myspace. But how can i get her from being to shy to talk to me on the phone or in person? Trust Me We Do Love Each Other.