My 28 Year Old Daughter Has Been On 40 Mg

My 28 year old daughter has been on 40 mg of Prozac for 2.5 months for anxiety/ depression. Her anxiety is much better but she still does not feel happy or herself. Her blood testing at the psychiatrists showed that this drug is "well tolerated" for her system. She also is tired and sleepy a lot. What should she do next? I keep thinking 30 minutes of aerobic exercise a day would help some. Even her appearance has changed some, such as gaining some weight and her hair is drab. Can you help us?