Check her temperature. Is she febrile? Is her enviornment too warm? Does she have an infection. Is she obese? Your last comment is scary. If you do not even have the money to get her health checked now, why did you let her get pregnant in the first place? What are you going to do if she has trouble passing her pups, or has a retained placenta and develops a uterine infection? Are you just going to let her die? Do not expect any person out there to diagnose and treat her problem. She needs a physical exam.