Och Anne, sorry to hear that.
Just been looking up all my goat books to see if there was anything. One did mention that just like humans they need enough water - 'drink water and get plenty of rest' and that you may need to tube feed her. Also that 'even kids that recover may be more prone to further pneumonia, develop a chronic cough, or not grow well', probably not what you want to hear.
It's difficult to know - ventilation, too much ventilation, cold / heat lamps. You have a lovely place for them and everything a goat kid could need. Do the females need separated from BB - would he catch it too, or the adults?
Good luck with them, keep us posted, will be thinking of you and them Anne