I have really long curly hair that goes down to my hips, if I get it layered will it look stringy?
My mom had told me if I have it layered it will look not so great because I want to keep the length but I want it lighter
Not at all! Layers are great, just don't get them too short.
Layers actually can add more volume and make your hair look thicker. I think it would be nice for you!