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Well, she caught her paw jumping into the back of the car actually. Anyway, she's been to the vet today. Apparently, the claw may well grow back, but the condition is quite serious and, if left untreated, she could have lost her toe. As it is, she's had a big jab of antibiotics, and is on antibiotic pills twice a day for a week, and is wearing a very fetching lampshade to stop her licking at her paw all the time! She hasn't quite got to grips with it yet, and keeps bashing into things as she walks about! She's looking a bit sorry for herself at the moment, but I'm sure she knows it's for the best. :-)