My 80-year-old mother has relentless lower back pain. What is a reasonable step to take?

My mom, my husband, my 5 year old and I live together in Canada. Two weeks ago she started having an acute lower back pain adding to an overactive bladder and chronic UTIs and also already existing balance issues and limited mobility. The first week she took Tylenol and muscle relaxer. The second week a combo of arthritis Tylenol, Naxopren and morphine. At this point her pain hasn't improve even though she has been resting although still moving around to go to the washroom, eat, take her meds etc. She is scheduled for a lumpectomy for an early breast carcinoma in two weeks. I plan to take her tomorrow to the emergency room, but with I read on the internet about low back pain in elderly, I really don't know what else they could do to help. In addition I have a full time job and a 5 year old and despite things not being crazy demanding (she can go to the washroom on her own and can eat on her own) I am feeling I am starting to reach my limits on how much I can spread myself between child care, work, elderly care and my own care (my husband is supportive and helpful too). One question that keeps popping in my head is whether is too early to start thinking in a nursing home for her (hoping we can get a subsidized one).
So I guess in summary I wonder: what else could they do for her at the hospital and... Is it too early to consider a nursing home?