Firstly, Thank you for all your responses, especially as it is the weekend and you are busy doing other things.

The responses are all helpful and I feel reassured by them too.
I've been in the industry for 12 months, I've had training with prochem, and of course I'm still learning every day on the job. I'll continue to to do other training and I'm looking into NCCA membership.
From the start I've wanted to provide the best service possible and to gain insight from training and other more experienced CC's like yourselves. The forum has been a great help so far and helps to offer feedback that you'd get in other jobs from other team members.
I have to admit when this complaint came yesterday it shocked me, as it is the first complaint I've had. I've cleaned a range of different carpets over the year and never had negative feedback from a customer until now.

From the start I've had a money back guarantee policy, and yesterday I needed to honour this for the first time after having offered to re-clean which she refused.
When I go to quote a job I do a
verbal pre-clean survey, and this experience has made me recognise the importance of putting it in writing!
I'm going back to the customer and will take photos as suggested by Glynn, which as you say may help to put her off making a claim on my insurance.
Thanks Jim for the attachment and Thanks to Richard for your offer, I will email you.
Kind regards
Ben