You have relationship with her, talk to her and see her. That’s how many non custodial parents live. It’s not easy but not uncommon. I’d say just enjoy time that you have with her.

Pretty much soon she’ll be on her own and neither you nor your ex will live with her. I do understand missing ones children. It never gets easier. My daughter (adult) lives very far snd I can only see her infrequently. You live with it. You adjust.