I think it is best to cool down a bit after a ride, I dont even like to go into the air conditioning right after I get back form a ride. I like to do a check of my bike, maybe wipe it down, check the brakes, ect... that way I can just top off the tire pressure and its ready to go.
I could see a problem with jumping in a hot tub right after a ride, or a very hot shower, but I dont know anyone who would want to do that. maybe she is thinking that hot muscles + cold water = cramping?
My suggestion... ride, check the bike, grab a snack, shower.
10 minuets between bike and shower should be more than enough.
"showering" wont make you go blind BTW...
