Stealing Lady Stephanie necklace

[mc5686]

I gave up and failed the "Thick as Thieves" side quest because Lady Stephanie is always awake by her chest (she NEVER leaves her room nor she sleeps) and I cannot interact with her (so I cannot even stun her).
This is after I had that love affair with her.
Is that a bug or am I supposed to finish the side quest BEFORE tackling "In Her Service"?

I understand the game ends in the middle of something (I wouldn't call this a cliff-hanger, just a book torn in two at a random point), but now several years have passed and there's still NO announce for a closure; am I missing something?

[Disturbed]

Don't know a certain time but in the noon she visits at last one time the chapel.

[mc5686]

I spent two (in-game) days on the door, skipping one hour at a time: she never moved. She is always standing in front of her chest.
If/when I enter the room she greets me and then she sits on the bench near the door apparently doing some embroidering work.
Also in that position she will see me trying to lockpick and she will call a guard.

[wjpower2003]

She is always away from her room for lunch with Divish, Robard and that other dude around mid day so you need to try then. The jewellery is in the very hard chest but you need a high lockpicking level to break it (around level 15 without potions).