How far you get in the bar game does not affect your progress with Crystal. Crystal is just one of the characters you unlock scenes for later in the game. Focus on progressing in the story rather than focusing solely on her. The only questline pertaining her that you *need* to do for story progress is getting her the real sword that is in Melkor's Tomb. Other than that, you should be able to progress the story fine.
Also, just to take a stab in the dark, maybe it'll help. Are you at the point where you can play the target practise archery minigame with Crystal in afternoons? Do that well enough, and you'll unlock a scene. After that, are you at the point where Crystal sleeps on the living room couch? Interact with her then, that's part of progressing her questline.