Why did fern's mother go to see doctor dorian in the book Charlotte's Web?

In "Charlotte's Web," Fern's mother goes to see Dr. Dorian because she is concerned about Fern's behavior and her obsession with saving the runt of the pig, which Fern named Wilbur. She wants to understand why Fern is so emotionally attached to the pig and seeks the doctor's advice on how to handle the situation. Dr. Dorian reassures her that Fern's attachment is normal for a child and suggests that she should allow Fern to care for the pig.