OMG last night i thought i was a gonna

There i was, sat in the car waiting for hubby to come out of the shop, engine running when all of a sudden white smoke just engulfed the car, I couldnt see anything, just a clould of smoke. well i thought it was on fire, Having been in a mini that set on fire years ago and seeing how quickly the car burnt out, I got my usually slow booty out the car quick sharpish and ran ito the shop shrieking at hubby the car was on fire. he came and turned the engine off, decided it wasnt on fire , lifted the bonnet and stem/smoke kept billowing out.
also red coloured water was running down the street. (coolant i think) well he called the AA who came and decided it was more than likely the water pump had failed, the coolant was empty even though we had recently filled it up. he put some water in and told hubby to drive to nearest garage and hed follow him. twice on the journey the car shut down totally, then restarted. he got it to the garage and im awaiting their verdict.
If it is the water pump, any ideas of costs for repair?
Im starting to think this car dosnt like me
janette
X5 2000 4X4i sport Prins VSI conversion. 136,000miles