girlfriend in trouble #2

[scottsdale84]

ok sorry just a little freaked out it is a 92' civic plenty of gas and oil and does not know how to check the trans. fluid. but she has never had her transmission serviced she was going down the road when she had decreasing supply of power to the wheels, then no power to the wheels she got the car stopped on the side of the road and put it in park. engine temp was normal and all seemed fine she put it in drive and went nowhere. she tried all of the gears even rev. but nothing. she turned off the car for about 5 min. and then restarted she could then move at about 25 mph for about 3 min but then no power to the wheels. is her trans. doomed? or could there be some kind of sensor that cuts off the drive to the car if she has no trans. fluid or if it is too hott?
ok she checked the fluid there is plenty..... is the tranny shot?