It does sound like separation anxiety.

First. Do not make a big deal of the dog when you return home. The dog will be excited and obucing and you must ignore the dog and not make eye contact until it calms.

Second. Do not make a bid deal of leaving the dog. No "poor baby, mommie is leaving you now, you be a good doggie." Simply get ready and go.

Third. Practice. Get ready to leaev the house, putting on shoes, gathering up the car keys. Go out the door and away from the house and out of sight. Return after (how long does it take for the dog to START barking? If she starts right away, return after 15 seconds; otherwise, return several minutes BEFORE she starts barking.) Do this repeatedly. Star teh car and drive away if need be. This lets the dog get used to the routine WITH THE RETURNS.

Finally, when the dog is left, she should have something to keep her busy. A Kong with peanut butter has been named quite often. A chew toy. Even more than one!

I AM sorry the landlord is already invloled, as it takes time to address separation anxiety. Is there a family member or friend who can take the dog for the day for a while?