But would any of that even be necessary? If one person has the dagger and Emma is in SB they could just command her to behave or something like “Emma I forbid you from trying to get this dagger.”
That is way too vague, since Emma doesn’t have to take the dagger in order to gain possession of it. I can see her directly or indirectly using someone to steal the dagger then hand it over to her willingly to give her the dagger willingly. In order to make that work you need to make multiple order related to any and possible plans or action that is related to any dagger thefts in order to have some success.