Stop cleaning and rest. Let her help you, she's your mom. It will probably help her deal helping do mundane stuff.
We have a family story about how my mom came over to my apartment to nurse me through some bad flu not long after I separated from my ex. My entire kitchen was cleaned, cabinets relined and the old copper tea kettle was shined for the very first time.
Doing mundane stuff allows you the solace of habit, something you can DO without thinking.
It is now 11:51. Have one more piece of chocolate and go to bed