Will not go into gear and leaking fluid

So my wife came home from work last night parked her car as always. However, in the morning when we went to leave the car will not go into any gear. You could here it shifting but would not move. I also noticed it was leaking fluid from the axle seal going into transmission. When I got it up of the ground had here shift from p r n d and you can hear and feel it engage but does not move. Then she put it in park it started spraying fluid from the axle seal that goes into the transmission on the drivers side. So my question is, is there a stop leak product for this? Is it too late to change the axle seal? Is the whole transmission shot?