No, in a few days there'll be a blue birthday blob over their head, and if you click it they disappear (die). They are not always there. Also, I think you can remove them from the household by clicking the family picture in the house?
March 2018 - last edited March 2018
there's 2 possible way to fix this
Have your sim chat with her. go to any community lot, at the bottom left of your screen, open up your Stories Panel. then at the top of your screen. tap the Relationship Panel . tap the socialize and there should be an option to call her over
Have your Sim chat with her, go to any community lot. tap on a nearby bench that can be used up two people, select "Have a chat with" and pick the sim that won't leave your home