do you wish to send her to old folks home or do you plan to try your best to look after her yourself at home?
her copd: is she on inhalers or nebulisers now.
hope she has stopped smoking.

i am sorry to hear that she will now be oxygen-dependent. However, compared to other methods of intervention in advanced COPD, eg empirical antibiotics, regular nebulizers etc, Domiciliary Oxygen supplementation therapy DOES prolong live, so, go for it and get a tank and concentrator. Make sure her Oxygen dose is well-prescribed. Know how much needed at rest eg 1L/hr, how much in sleep (if needed) etc. You guys aint gonna allow smokers anymore in her house, this prevents KABOOMs. Oxygen-dependency however, will signify her entry into the Terminal COPD category. Any chest infection, treat early (with antibiotics etc). I think she will do well (no cigs, now get O2, now has maid ie less physicality for her). good luck