of course sakura deserves the heroine part. i've explained my thoughts pretty clearly on a thread somewhat similar to this regarding sakura. the fact is, she's perfect for the heroine spot. i only think she gets her strength from being around both naruto and sasuke. and when it's a real emergency then she'll step in. most times naruto or sasuke doesn't need anyone's help (mainly because they're also main characters and major powerhouses). but when both naruto and sasuke are out of commission (which is almost never) then she steps in and does her work. long enough for something significant to happen. it's been proven in the forest of death, twice. if hinata were in those situations, she'd fare worse than sakura. especially in the fight against sasori. so it remains, sakura is the perfect fit for the heroine spot from the leaf village. for someone with no kekkei genkai (like hinata), no special weapons (like tenten), no special ninjutsu (like ino or temari), and just brute strength AND healing, she's come a long way.
but like i said, i explained my point pretty thoroughly in a thread not too long ago about sakura. i don't wanna repeat myself. then again, this is just my opinion