She measures 3.
Why people would rather have Conan be with Haibara is completely understandable.
Her best friend besides Shinichi is her classmate Sonoko Suzuki, who often teases her about her relationship with Shinichi.
That's the theme that underlies these two characters, I think - two ways to approach the world, and to handle one's affairs.
AND LET ME KNOW IF YOU STILL LIKE HER LIKE ME :- EDIT: I like Ran myself.
Ran's purpose in the DC universe is to serve as Shinichi's main incentive to return to normal.