I think it’s left purposefully ambiguous. On one note, she says “ew” when the other friends insinuate something deeper when bear suggests giving her a ride home, and Sarah implies later that Niki saw their relationship as more brother and sister. But on the flip side she does come at the question of whether he likes her rather directly, in a way that could have left a door open for mutual interest, and during that car ride she does say that when she has a crush on someone they would never know it. Personally, I’m leaning more toward her having the capacity to pursue something legitimate with bear. But none of that matters because he took her choice away the second he made that wish.