If she was tubed fluid into her lungs you would know it immediately. She would have instant trouble breathing, coughing, gasping, open mouth breathing, seriously distressed. If she aspirated a little fluid into her lungs after the tubing or some other time the symptoms would probably have shown up a good deal earlier than it seems like they did.
It sounds like she had some type of bug to me at least at first
. Sometimes viral pneumonia can cause those babies to become immune-suppresed really fast and so their bodies put all their energy into fighting the virus and none on keeping warm. That's why we lose a lot of outdoor animals to sickness overnight, IMHO. Her owner did right by bringing her in the house and tubing warm milk to bring her body temp up.
When you put your ear to her chest is that when you hear crackling or rasping? Or can you hear her kind of snort and sniffle when she breathes through her nose like you would if you had a bad head-congestion type cold?
If she has aspiration pneumonia it wont get better until it gets treated. If she has bacterial or viral pneumonia that can be very dangerous to her and sometimes contagious . . . viral pneumonia can be self-limiting, but it's VERY risky to just wait it out.
Check her temperature. Normal goat temp is 101.5-103. If it's high treat with antibiotics . . . I would start with penicillin at 1cc per 15lbs (dosage per Fias Co Farm). If it's not high I would start thinking about it not being an infection, but something else.
Check her palate top and bottom and make sure it's not cleft. Is she peeing and pooping ok? How old is she? How long has she been going on like this? Is she gaining weight and otherwise active, healthy, BAR (Bright, Alert, & Responsive). Does she have sibs and if so, do they have any problems? Was she rejected by momma?