She's already made it clear that she's not into you romantically, so don't even try there. Of course you're going to value the friendship more than she does because you have feelings for her. These feelings aren't mutual, and probably never will be.
Who initiates your conversations? Is it always/pretty much always you? If so, I'd say she's replying out of politeness, and probably only sees you as a casual friend as others have suggested. Maybe you're messaging her too much? Coming on too strong?
I'd say if you're always the one initiating the conversations, refrain from doing so for about a week. If she initiates a conversation during that time, she probably considers you a moderate/semi-close friend. If not, she probably sees you as the kind of person she'd like to catch up with once a month or less.