Steps to reproduce:
-Kill the hag before she turns invisible. Use potions of speed/basilisk poison/etc. to OTK.
-After the combat Mayrina gets angry and says you've ruined everything. Quest log updates with something like "check the hag's lair, maybe there's some way to help Mayrina still."
-Go through the lair. All the danger is gone since the hag is dead.
-Retrieve the wand.
-Speak to Mayrina outside by her husband's grave. Weird dialogue where she asks something like "What is this? Where am I?" as if she has just seen through the hag's illusions. No options to give her the wand or tell her about it.
-If you resurrect the husband, then you're forced to kill him. Afterwards Mayrina, without entering into a normal dialogue, announces "What? Where's my husband? I've come all this way and someone's dug him up?" and then just runs off. The quest log doesn't update. If you follow Mayrina, she just despawns after making her way through the teahouse and into the bog.
Possibly related to the widely reported Ethel bug, but I thought I'd post this version in case it's a separate edge case.