Greetings, and thanks for the question.
Firstly, I apologize for the delay. I just got online and saw your question and wanted to get you an answer as quickly as possible.
I'm sorry to hear about L SU's condition. I'm sure it must have you worried, with good reason!
Based on your description of her condition, it's most likely that L SU is suffering from a severe case of mastitis. In other words, and infection of her udder and mammary glands. I'd like to ask you a few questions, however, so that I might give you a more complete answer.
1): Has L SU ever kidded before?
2): Have you taken her temperature, and if so, what is it?
3): Did the kids get any milk at all from her when they were first born? How are the kids doing?
4): Is L SU eating and drinkng?
5): What does L SU's diet consist of?
Thanks, ***** *****'m looking forward to hearing from you.