Hello and welcome to this site! I am sure you will find lots of help here. I care for my husband who has severe COPD and know how difficult it is to watch someone you love struggle.
The very first thing I would recommend is to telephone the BLF helpline (click on the red balloon) - they have lots of leaflets etc. with very helpful information. They can also advise what your mother should be expecting and what care she should be receiving. We found that my husband was given the diagnosis and left with it - it sounds as if the same has happened to your Mum. I researched and found that there was a specialist respiratory team in our area but had to be referred by our own GP. We were and that was really helpful. The team run a pulmonary rehab course which is consists of monitored exercise followed by an hour of really useful information about COPD. I think it saved my husbands life! It seems though it is something you have to ask for rather than are offered in some areas.
My husband was offered a specialist but told as he was coping at home there was no need so has never seen one - actually that suits him so I have not pushed it and as I know we have the respiratory team on hand dont feel that we need to. I dont know how your Mum would feel about this - but I wrote to our surgery so that the doctors/nurses have permission to speak to me about my husbands illness and this has been very useful.
One of the problems I have found is that because this is a chronic long term condition the doctors tend to let you get on with it! There are lots of medication available to help your Mum - she may need other inhalers. I am sure you will get lots of useful advise. Take good care, TAD xx PS your Mum is very lucky to have you!