You should ensure that you spend more time with her and your friends to get her comfortable. Insist on how being open about it is important for you. You should also ensure that you consider being in the places that she is comfortable.
Honestly, I've gone through this. If she says she likes you but doesn't wanna let anybody know or show it, then she just might not. When someone likes me and shows it that's how I know someone truelyyyy likes me.*