latenna questline?

[This World is an illusion, exile]

so guide says talk to her immediately after defeating Commander Niall and before taking the Haligtree Secret Medallion (Left) but how do i do this if her wolf at the shack is dead and shes nowhere to be seen? i killed Niall but cant summon here in his area

[Lizard Ears]

I think the guide is wrong. You only need to summon her in a specific area in Consecrated Snowfield.

[Gamerzilla]

Sounds like you didnt talk to her at an earlier opportunity to me. Once you find her initial spot and have the Haligtree medallion half from Albus, she asks you to do something which you must agree to. She then joins you as a summon and is with you for good. Either you have the spirit ash and thats why she is not there, or you did something to kill her and are hosed.

[Xelrazad]

End is behind Wandering Mausoleum (Consecrated Snowfield) church..
The Towering Sister Summon Latenna in front of her to complete her quest (assuming you collected her Spirit Ashes).

BTW this map is good for quests easy to use..

https://mapgenie.io/elden-ring/maps/the-lands-between