Mom diagnosed with stage 4 breast cancer

Hello, my beautiful mom (73) was just diagnosed with breast cancer(Her2 positive) 5 weeks ago which has metastisised to her bones. She went through 5 days radiation therapy on her spine and thanfully the pain is gone in her back. She was due to start chemo next week but has been taken into hospital with pneumonia. We are all worried about this setback. She has been told she will need 8 rounds of chemo every 3 weeks. 

It is all so new and scary. I'm worried she won't have strength for chemo. Looking for advice to help her. Thanks Maeve