Yes, I feel terrible. She's going to see if it fits my brother, who is bigger, but I still think it will be too long.
I had a frustrating evening too - I had to cut quite a chunk of yarn out of the ball as there was a section where it just went massive and fluffy, followed by a section so thin it looked awful. I still think I have enough yarn to finish, but I'll be stuffed if I think it needs extending - I checked last night, Wool Warehouse have sold out and there don't seem to be any other UK stockists. I could get some at exorbitant price from Amazon, or on import, but that's it.
It doesn't change my plan - finish as per pattern, sew it up and check the length. I could probably get away with edging in a different yarn, or not edging at all, and sacrificing the yarn I have left for lengthening, if I desperately need to.