It seemed like the tome you’re supposed to give her wanted to go into the bag that stores your runes, but mine was full. The tome fell on the ground when the apprentice mage gave it to me (instead of going into my inventory).
When I tried to pick it up, it ended up going to my “key items” (the last inventory tab) stash. I get the same “it may take some time” message as you, now.
For me the solution was to create a new realm and get to the same point, in that case the quest activated correctly. Not ideal but in the new realm you can go through mobs easily being over-leveled
I would suggest to create a new realm and rush to that quest. Being over-leveled makes things easier. The only issue is the crane might not rotate and once you get used to have the stairs you forget how you originally got into places
For me it worked at first and I was able to enter the dungeon.
After Hotfix 4 however it stopped working and I can not interact with the statue anymore.
Reverting saves also did not help.