I don’t think she ever stopped being a member of the Hyuga clan. She simply lost her position to become clan leader. She is still Hyuga and still a part of the clan she just was stripped of the heiress title.
Also let’s not confusing weak with lacking. She is a timid support type. Her heart never seemed the type to fight unless it was a last resort.
I always thought she’d make a great medic ninja and in this could have been a worthy Sakura rival. Hyuga are already naturally gifted in chakra control and she prefers to support. Couple healing with her level of Gentle Fist abilities I do believe she would have actually made quite the formidable opponent of faced in a fight.
But again she is the timid kind nature. Healing wounded and particularly Naruto during/after fights would have given her some legit screen/panel time to form an actual romantic bond in the anime/manga and not just the few panels and 1 movie we got.
Like Sakura, A lot of wasted potential on Kishi’s part.
I'm so glad I'm not the only one who though it would have made sense if Hinata was a healer.