She lies in bed and tries to commune with the artifact without giving any outward sign that she's doing this.
Clerics don't really do charm spells unless they have the charm domain, and while this is one of Shelyn's domains, it's not one of the ones that the pendant selected for her. She can't gain access to Suggestion.
Clerics can, however, make people very, very sick. It's evil, of course, and if she makes a habit of it it could cost her her alignment and remove her powers (though it probably wouldn't remove the pendant), but she doesn't have a lot of better ideas.
In the morning she reaches over and casts Contagion on him, infecting him with blinding sickness.