Her Part I appearance was just filler. Considering only canon material, there really wasn't any chemistry between her and Gaara; she's just another one of his fangirls.She was Gaara's student in part 1, and they seemed to have some pretty good chemistry.
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If Gaara did marry and have kids, it would have made sense if he went with her....
In this situation, perhaps (not a big deal at all as it's super minor), but not overall. Gaara is the best character in the entire series.Kishi f*cked up Gaara.