Final answer:
The recommended daily protein intake for a female marathon runner weighing 126 pounds is approximately 69-114 grams.
Step-by-step explanation:
The recommended daily protein intake for a female marathon runner weighing 126 pounds would be approximately 69-114 grams. This is based on the general recommendation for athletes to consume 1.2 to 2.0 grams of protein per kilogram of body weight. However, it is important to note that individual protein needs may vary depending on factors such as training intensity and goals.