The pain she is experiencing might be related to:
- urinary tract infection
(common after delivery) :can check by urine analysis
- vaginal infection
(also common after delivery); can check by vaginal swab testing
- any digestive problems (related to post-delivery constipation
); can check by abdominal ultrasound
I suggest to consult her physician as soon as possible to get proper diagnosis and treatment in time. If your wife is breast-feeding, do not forget to tell this to the physician when prescribing the treatment.
All the best!