Anna, a 28-year-old first-time mother, presents to the clinic with complaints of breast pain and fever. She is 3 weeks postpartum and breastfeeding her newborn. She reports pain and swelling in her left breast for the past two days, accompanied by redness in the upper outer quadrant. She also notes fatigue, chills, and a fever of 38.9°C (102°F). Anna mentions that her baby has been struggling with latching, leading to prolonged feedings and occasional engorgement. Examination: •General Appearance: Fatigued but alert. •Vital Signs: •Temperature: 101.2°F (38.5°C). •Pulse: 90 bpm. •Breast Exam: •Left breast: Redness, swelling, and tenderness in the upper outer quadrant; warm to touch, with no fluctuance. •Right breast: Normal, no signs of injury or inflammation. Anna is diagnosed with lactational mastitis and prescribed dicloxacillin 500 mg four times daily for 10 days. However, her symptoms do not improve after 48 hours of antibiotic therapy. What is the next best step in the management of this patient?