Green colouring may just rinse out with a suitable detergent. However more likely to be permanent if she's messed about with it this much, probably used red hot water as well. The insurance company will expect you to try and remove the stain but not to go on and on. If it doesn't shift, measure the carpet, describe the type, fibre, backing etc and try and get some idea of cost, sometimes custy remembers or might have the receipt. Put this all down in writing, preferably printed, give to customer and charge between £55-85 for the privelege.