Every time I tell her to go a picture of the sink appears above her...
i think something is in the way or mabey its backwards because sometime if they cant get to it the picture pops above it so i would make sure its positoned right or nothin wierd is in front of it... thats all i can think of
Go press control shift c type in Testingcheatsenabled true once you do hold shift click on the object in the way and delete it or your toilets broken
The sink is about hygiene, not bathroom. And the sims sucks.
try moving the sink, her path to the toilet may be blocked.
The sink is blocking her way.