>>48662524C'mon Jasmine is the only one who has a canonical friendship with Erika, and Misty is the only other Kanto gym leader who has a friendship with Erika in other media like Masters or Pokemon Special (and Erika is probably more to close to Misty's age than Sabrina).
Heck, Erika has even more interactions and things in common with girls from other regions like Rosa, Skyla, Valerie and Caitlin than fucking Sabrina.