Hello and welcome.My name is ***** ***** I’m a biologist with over 40 years experience raising and showing rabbits. I'm sorry to hear of this incident. I'll give you something to try, but it is a little messy. You'll have to vacuum the house afterward. Sprinkle flour on the floor to make a fine coating. Do this just before the family goes to bed so no one has to walk in it. In the morning, look for bunny tracks in the flour. This should lead you to where your bunny is.
If you find no tracks in the morning, something has happened. Your bunny may be trapped under or behind furniture or appliances. She may have gotten into a heating or cooling duct. You'll need to search thoroughly in each room. After finishing a room, close the door, so she can't get in that room (once you're sure she isn't there.)
If you're sure she didn't escape the apartment, the flour trick should work. Animal control won't help unless she did get out and someone turned her in. If you think she may have gotten out of the apartment, alert mail carriers, newspaper delivery people, and all your neighbors.
I hope you'll be able to sprinkle flour over all the floors, and in the morning you'll be able to track your bunny. I'll check back with you then. I wish you success.