Procrastination was destroying my life because every time I didn't do my work, it wasn't like I was doing something important; I was often just wasting time. This meant that eventually, I would have to do my work, but it would always be a rushed job.

Procrastination can cause severe problems if you let it get out of hand. Such people are more stressed, anxious, depressed and sleep-deprived. So, there are reasons to worry about your sister. I'm sure you don't want your sister to end up taking meds like antidepressants.

The most significant thing that changed for me was finding purpose in my life and having a goal that I could work towards. Procrastination almost destroyed my life because I didn’t know where I wanted to go, but now that I have direction, my drive is my most powerful tool to fight procrastination. So, my advice is to help your sister find something she will enjoy doing. It can be a new job or a new hobby. Ask her what she always wanted to do but put that idea aside for later. Also, changing the environment can help. Go somewhere together. Even a short trip can make your sister look at the same things differently.