Assigning bed to butler

I have hired a butler and created her her own room, I even clicked the bedroom door to allow access only to her. For some reason, when I click on the bed and press 'assign bed to butler,' it does not work because she still leaves at the end of the day and a new butler shows up in the morning. Why is 'assign bed to butler' not working? I have tried completely deleting the room and adding it back. I have fired multiple butlers...not sure what else to do. I do not get an error mesage or anything when I try it..I've been waiting to see her wave her hands in the air or for something to show up over her head thinking the bed was blocked... but nope...nothing. All of my sims have the option to assign her a bed, it is not greyed out or anything. What is up?

Oh, and when shoe does show up in the morning she stands by the side of the house for hours before actually coming in...why are the butlers so funky??