Not sure if one of our ewe's has got mastitis in her udder or not? Her udder is very large and saggy and she has trouble walking with it. She's not grazing, just standing in the corner of the field away from the others in the flock? Am not sure if it's that or not? She had one healthy lamb & lamb seems upset by mum being ill, she is also not answering her lamb when she calls. The lamb is now 6 weeks old? Can anyone give me some advice on this??