I am fairly sure the kitten is a shorthair, that means the father is too. And I'm very aware that kittens from a BYB can be very far from the standard as they rarely work to improve/keep up the quality. However even a bad quality purebred (BYB or not) Raggie would still have a long coat..I understand..... The mother being a purebred Ragdoll does change things though.... The father might be a short hair, we don't know.... But, kittens from a BYB can differ quite a bit from show quality kittens from a reputable breeder.... And that might be the case too imho.
I also find it a bit unlikely that the mother would really be a purebred (as in registered pedigreed) Ragdoll, a mix would be more likely. It's not common to dump your $$$$ cat outdoors and let her starve in a shed. Specially if the cat was sold intact instead of spayed, which usually would mean the cat is a breeding queen sold to a cattery, or originally from a BYB and possibly not purebred after all.