Found this post on reddit, it sounds a bit crazy but it is very strange. Avril had half of the young female population eating out of her palm when she was only 17. Then she started protesting the war in Iraq and speaking up on some issues that are not so popular with the elites. This OP submission statement from reddit was on point:

"I first noticed this in a discussion on askreddit about what was people's favourite conspiracy theory. One of the top comments was about how Avril Lavigne had died in 2003 and been replaced with a look alike. At the time I had been quite deeply researching the human trafficking and satanism stuff happening within elite circles and I actually figured it might be a welcome change to look into something that seemed very far fetched and frankly a bit more entertaining than that type of depressing research. Also some intuitive feeling like... yeah? She did really change a lot from what I remember? After a while of research I was actually quite shocked! This did definitely not feel like the same person at all! At the height of her popularity she is protesting the war in Iraq and doing things that probably would not have been popular with the power players of the world. Did they have her replaced and made her into this obedient pop princess who looks as sterilized as any american idol winner? Did they MK-ultra her into becoming this robotic smiling cliché? Young Avril Lavigne was anything but. She looks very similar but the feel is just off. I had been researching a bit and then I found this documentary in a comment somewhere on youtube. It actually goes into some detail about MK-ultra and Hollywood occult stuff as well. I was never sure about the whole "she committed suicide" theory and this documentary doesn't seem heavily focused on that stuff either. It actually doesn't present any concrete theory but rather just shows a lot of footage and raises a lot of questions. Highly recommended!"