How do i convince my gfs parents?

i want to know if theres a way to convince my gfs parents to let my gf come to california. she lives in indiana. my gf rather come to california then me go to indiana. we have seen each other once in Arizona where she went for her spring break. i didnt meet her parents just her grandma and she saw my dad. i had to convince her parents once to let me go see her in Arizona but i think it worked because her grandmother was with her. this time she will come alone if they let her come to california. she told me her parents like me and think im respectful. but i want to be able to convince them to let her come to my house in california im 16 and shes 14 can anyone help me or give me ideas please