Tinker Bell typically didn't commit to such things as being on time to places and whatnot, she was a tiny creature after all, and those things were usually saved for creatures that understood time and days, like humans. Peter wouldve known exactly the day and time, but Tink only knew what Peter had taught her, though now she was learning from Christine. The woman may not have been her Pan, but Tink was willing to learn from her and accept what she said to be true. So, Christine was close enough.
Tink flew around Chrisine in a circle, coating her with the golden pixie dust, before settling once more mid-air, hovering so the woman could see her clearly, "You haven't met any other pixies?" She asked curiously, but didn't find that strange. "Thank you!" Tink chimed in response to Christine saying she was special. She was glad that they were friends, and soon Tink would get to more other grown ups. Maybe grown ups weren't so bad after all.