I agree with @merpreb , my brother was diagnosed with extensive stage SCLC almost two years ago. He had PET CT, and then, the actual type of lung cancer was decided with a biopsy. He is on his third type of treatment and has had a decent quality of life for all of them. Not always easy, but very do able. Be sure to get all testing as fast as you can. All of that information can go with you to Mayo.
Is she scheduled for a PET yet? Biopsy?