I am sorry that you are going thought this with your Mum Donna.
So sad that you have lost a little more trust in her again.
I was reading another thread from you in November where she was caught out before and I appreciate how you must be feeling.
As a few here have pointed out it is a tough addiction and maybe she may need some professional help?
BTW I sympathise with her as well.
I was one of those addicts that stopped the night before surgery. Have not had so much as a puff since then as I am honestly scared that could be the start. I have a few other incentives why that is not going to happen. One is the look of my parents face in ICU the day after surgery and they have since told me I was practically unrecognisable (I did not see myself for around a week but I still feel guilty at the shock I must have given them an my sister). I also thought to myself if I was ever tempted I would just look at the crater in my wrist and that would pull me up.
Luckily it is getting close to 4 years now and I really rarely think about it.
Wish I could be more help Donna except to say I understand how you must be feeling.
Have you thought about counselling for her? There may even be some professional help available from the hospital team she would still be seeing?
Love
Gabriele