I wonder if we need to see a pic of your mum?
a few things to check 1) water level when Engine is cold. 2) find out if the fan is belt driven or electric. 3)is the car losing any water?
do not drive it if the temp,is going in to the red, you can ruin the engine.
You need to learn the basics such such as checking the oil and water regularly.
most people are not dodgy but ask the mechanic for the prices as he goes and post up on here.