You can buy the orchid compost from the garden centre together with a bigger orchid pot. Just transfer and give a watering but don't let it stand in water.

Try to spread the roots out as much as you can in the new pot and tuck the orchid compost between the roots then fill in with the rest of the compost. water it well then leave it to dry out a little before watering again, nothing kills orchids more than over watering. take off any dead roots it may have.

Thank you Cammomile & Chino for your replies. I will pass this information on to my daughter.