"Gdzie moja łyżka" ...... don't learn Russian and Polish at the same time kids! :|
Well, it would work, it's just not perfectly grammatical and therefore less polite.
In the sentence "Where is your bed?" system accepts answer with jest omitted. Maybe it is a good idea to make either this one accept it too, or that one to reject. It adds a bit of confusion.
We decided to add it, but please remember that it's less polite.
Is moja łyżka in the nominative here?