Then the engine temperature light started flashing red and I must have kept driving for just over 10 minutes..
Yeah I know! I'm such a chump, I feel terrible

That's when the vapour started spewing out the back. I pulled over, and worked out that the fan/alternator belt had broken.. such a simple thing to fix had I just stopped at the first warning!!
So now I'm very worried about her.
The vapour was coming from a leak at the connection point where the coolant hose connects to the engine. So that is being replaced now but how much other damage could this stupidity/recklessness have caused?
Thanks for any info