She's irrelevant but she's also a horrible person. Hinata is a selfish kitten that doesn't care about anyone expect herself.
When her cousin died saving her life she cried a bit, and as soon as she got what she wanted. She forgot he even existed.
When Naruto was dying she abandoned her friends and decided the best way to pray for Naruto's well being is to pray to a dead guy that she doesn't even care about.
Every time when she could've been there for Naruto, she chose to ignore him entirely. Even when she saw in how much pain that kid was. She still didn't care. But as soon as she saw an opportunity to confesses her crush she took it, not because she wanted to help Naruto because she didn't do anything to help him. She did what was best for her. She never cared about Naruto or anyone.
That is apathy. And apathy is death. Worse than death.
You know the way hinata confess, naruto ask katsuyu to told everyone not to interfere/come to help him when he fights pen, but when naruto dying, hinata saw it as 'Naruto about to die i don't wanna die as a virgin, i need to confess my love, but im too shy that everytime i meet him before... i pass out, now theres no one there to see, this is my chance!!'