Final answer:
The described symptoms align with Plantar fasciitis, which is associated with morning foot pain that worsens with activity and is often related to obesity.
Step-by-step explanation:
The symptoms described by the 48-year-old obese female, particularly pain on the bottom of the feet with the first few steps in the morning that gets worse with prolonged walking, are highly suggestive of Plantar fasciitis. This condition is characterized by inflammation of the plantar fascia, the thick band of tissue that connects the heel bone to the toes. Obesity is a known risk factor for plantar fasciitis due to the increased pressure on the plantar fascia. In contrast, gout typically presents with acute, severe pain and redness in a joint, often the big toe; Morton's Neuroma causes sharp burning pain or numbness between the toes; and Rheumatoid Arthritis tends to involve multiple joints with swelling and pain, rather than isolated foot pain.