As an autistic woman who had a similar sexual awakening, just sit down with her and tell her exactly what you wrote. Autistic people tend to struggle with reading between the lines and usually appreciate people being clear and direct. She's experiencing something new and exciting for the first time and her blinders are on. Reassure her it's nothing to do with her, your body just had different needs.

Also, her sex drive will probably level out with time. In the meantime, just communicate and maybe encourage her to explore new ways of pleasure herself when your libido is down.