Sleep Help?

My baby cries in the middle of the night in her crib. She's 8 months. She'll sleep 8pm-12 am. Usually I'll feed her, change her diaper, etc but she won't stay sleep in her crib. She'll be up again around 3 am.  Idk what to do. I've tried bath and playtime before bed. But then she'll wake up in the middle of the night and cry until I go get her. Once I get her, she thinks it's play time. She wants to stand and climb all over me in my bed. When I try to lay her down with me she throws a tantrum and sits up/stands. If she's fed and changed can I just leave her in her crib if she's crying? She just wants to be held. If I walk in every 5 min she'll cry even harder every time she sees me.