Hi Gypsy have you thought of going round the house with her and putting sticky coloured dots on items she says should go (or you both agree on) that way it doesn't have to be all done today but you can have a little respite but the dots will be a glaring reminder to continue the cleansing!
Don't know about you but my massive sorting sessions often leave me more in a mess than before and this way you take a little presure off but still maintain the momentum. Good for you anyway I am so proud. I think it's more the thought of the task we find overwhelming but when we actually start i is less painful and more liberating than we imagine. Having a good friend tho really helps. Well done .