Thank you for your reply.
It sounds like your friend has delusions.
I agree with you. Her condition is very worrisome as she is giving birth to her baby. She may already have mood disorder prior to pregnancy.
So, she may be vulnerable to having postpartum depression
and psychotic symptoms.
Does her husband and mother know about this?
You stated she doesn't think she has a problem. People with delusional disorder may be resistant to seeking help from a doctor as they "believe" in their delusional thoughts.
They may not be dangerous to self or others.
But, your friend may need treatment and be monitored by her family and doctor closely as she may be at risk of having postpartum depression and psychosis
Can you tell your friend that you are worried about her thoughts and she may have severe anxiety
inside? Tell your friend that you want to let her family know about this.
I think her family and husband should know your friend's states and she may need to see her doctor sooner or later.
I'll pause here and await your response if you have more questions.