Hello ma'am/sir, In my opinion you should start doing exercises within pain range and eventually progress them, If you're consulting a therapist it will help your mother recover faster as we use electrotherapy to reduce pain , and manual therapy like joint mobilization which helps her to improve mobility as well.
I hope this helps.
Thanks.
Next Steps
for better results consult therapist.
Health Tips
don't lift heavy weight,
don't sleep on that side,
don't use pillow while lying on back , use pillow when lying on other side.
don't do local massage.