Matan--
You can teach her to sit up and beg and to roll over.  Something else mine
enjoy that is not exactly a trick but is cute to watch-- get one of those
long clear dryer hoses (like the Ferret Freeway product), pop a ball or
plastic easter egg in one end, and then introduce the ferret to the same
end of the tube.  My ferrets will push the rolling item all the way through
the tube.  For extra variety tie knots in the tube and let her push a toy
through it.
 
Debra in Fort Worth
[Posted in FML issue 3367]