Hi,
Need more insights on your problem to help it out. Not sure, if she has this behavior before or after the delivery. This could be a symptoms of post partum depression.
She needs a rest and support from the family members especially from husband.
Next Steps
Visit a psychologist and take professional help.
Health Tips
Allow her to have some good rest and healthy foods. Listen to her instead of arguing or explaining things. Be supportive and help her in taking care of the baby and daily chores.