Seeking help!

Hi all, My name is Shani and I am 21 years old. In June this year my mum who is 47, was diagnosed with Breast Cancer after finding a large lump in her left breast. She was started on Chemotherapy straight away as the Cancer had spread to her Lymph Node under the armpit, but no where else luckily. She had her first 3 months of Chemo and then started to go down hill..my mum has also suffered from Schizophrenia for twelve years now and unfortunately stopped taking her medication whilst having the Chemotherapy. It has now been two months since her last session and she will not go back. Her mental state has deteriorated so she was put in hospital for eight days to hopefully get her thinking straight..but she has come out the same if not worse. She will not talk about the Cancer with anyone, she is missing all of her appointments and is just seeming to be a completely different person. I guess I am writing this as I am seeking some sort of help, I am an only child and I am trying my best to get mum back on track but I feel she needs some real guidance and inspiration. She is supposed to have Chemo once a week and has now missed 7 sessions. She is also supposed to be having Herceptin for the next 15 months but has now missed 3 doses. I am starting to get real worried. I am aware everyone has the right to refuse Chemo, but her mental state is not 100% for her to be making such a huge decision :( If anyone has any advice or similar stories please share with me. Thank you x.