My mother has just had a diagnosis of Parkinsons, which is

My mother has just had a diagnosis of Parkinson's, which is unconfirmed as she absolutely refuses to go through any further tests. She is 82, has COPD through 70 plus years of secondary smoking, has high BP (on three tabs, not sure what) and has kidney disease at around stage 3. The only daily contact she has is with my uncle who is 87 and has a progressing meningioma, with short and long term memory loss. She is exhibiting problems with behaviour, having a very short temper and also 'dwelling' on things which bother her, which are usually not something that most of us would worry about. So far, this hasn't seemed much like a question, I admit but I just wanted to set the scene. Essentially, no one officially 'knows' about this diagnosis - the GP mentioned it to me, in all innocence, assuming I knew. I had rung to tell him of some rather odd circumstances we noticed during a recent visit which implied a possible TIA. I have shared with my aunt (also elderly but in good health) on the basis that someone should know what's going on, but now she is worried (which was not my intention) about what will happen now. I know no one has a crystal ball, but am I right in thinking that with everything else that is going on with her health, the PD will progress quite quickly but before the end she may well succumb to an exacerbation of COPD or a bout of pneumonia. I should say that in fact I care more about my aunt, who is more of a mother to me than my real one has ever been. I need to guide her as to what she might expect. I live too far away to be able to visit more than now and again and can't drive at present due to a broken leg.