Hello....
Homoeopathy can definitely give a long lasting relief in pain of lumbar canal stenosis.
To suggest medicines for this problem will need more detailed history like abt her nature/ Temperament.... her likes n dislikes in food, her thirst, bowels n urine related any issues, sleep n dreams...... etc.
So please consult some Good Homoeopath nearby or you can also consult me online thru Practo Chat.....
Health Tips
Along with medicines Doing regular Alignment Exercises will be very useful.
Avoid forward bending, lifting heavy things...
Use of lumbar belt may give her support during her daily chores.