What are the features in Ella's history that suggest a stress fracture?

The features in Ella's history suggestive of a stress fracture include:

• Gradual onset of pain over two months with no specific preceding injury.
• Pain that is only present during football training and resolves with rest.
• Specific, localized pain at the anterior aspect of her lower left shin.
• Absence of pain during non-impact activities like swimming.