Please help! Why did this shy girl get so scared?

ok.. i think that either.. she likes you to and she didnt know that you liked her. or. she may just think of you as a brother and for you to like her its kinda wierd. honestly i think you should talk to her about it. and if not. then ull truely neverr know. p.s.im not saying be blunt about it as u talk to her but dont drag it out either!! i promise ull b happier once u know! :)