Could it be something besides the transmission

Was driving doin about 80 had cruise control on and all the sudden with no warning it was like the cruise control just kicked off but I lost the transmission I guess cause it's like no matter what gear you put it in it just rolls like it's in neutral well when I popped the hood I could hear a vacuum line obviously severed which now make 2 leaks that's all I could find wrong tranny fluid looks fine red in color does not have no metal in it and does not smell burned plus the seal or whatever under neath is fine. I am a female and everyone tells me my transmission is gone, because it ran smooth with no trouble and the way it went out I have a hard time understanding how? Help if you can thank you