Answer:
There is no way to make someone else like the same sex they do that on their own if they began to find themselves having more questions about what being with the same sex is like you could call them bi cururious but if they want to be a lesbian they are going to like girls that's not something anyone else can do but them
But if you want to try something:
heres what you do:
you have to become there friend be friendly give them hugs always listen to them
once things fall into place hug them more often maybe even a playful hit
if you two are alone are something heres when u make the move
try to kiss her look into her eyes and mov closer if she provides the same contact then try to make the first move
kiss her
i hope this helps
:)