I think you need to discuss her care needs with her provider. DNR does not and should never mean do not treat.
I wonder if you have something similar to what we have here, which is called Goals of Care. Every patient is to have GOC discussed when they enter hospital, if it hasn't been done already. There are seven levels:
R (Resuscitative care) 1 is everything.
R2 is everything except chest compressions.
R3 is no chest compressions and no intubation.
M (Medical care) 1 is DNR, no ICU, but may transport to hospital and may do surgery, also treat active medical conditions
M2 is similar to M1 except it is surgery and transport only for symptom management
C (Comfort care) 1 is treatment of symptoms only, do not treat active medical problems, transport or surgery only for symptom management.
C2 is symptom management only, transport and surgery are not done. (C2 is for people expected to die within days.)
At discharge, the patient is given the original GOC document; a photocopy is kept in the chart. We tell patients to keep it on their fridge as EMS will look for it there if they are called. They are to bring it to hospital if they are admitted.
Based on what you describe, an M1 or M2 might be appropriate for your mum, but you'll need to have that discussion with her provider.