Confused between friend and board exams what should i do?

well i have a frd who lost her parents and is left all alone in her life she is 22 years and i am 15 we both r good frds from like past 2 years she has a big bro bhabhi and her masi with whom she stays bt she doesent gets tht love from them.for her i am the end of her world. she thinks me as her mom dad and a lovely sis .she means a lot to me also and even i mean a lot to her .ever thing was fine till now bt now since i got my 10th board exams my parents arent allowing me to spend time with her .and if i dont spend time with her she feel left out .she personaly says me tht its ur 10th u study bt in heart she feel tht she has no one to tlk with .and she is rit i am the only person with whom she tlk .so now plzzzzzzz tell me wht should i do should i sotop tlk to her or should i give her the same time as i used to give her befor tht is 5 hours a day