While I don’t believe she’s ever going to meaningfully wake up, I wouldn’t be so quick to be sure that’s decomposition.
There are a couple of minor, harmless skin disorders which can cause unsightly pigmentation issues in blacks. I have a dear friend who has one of those conditions and it looks rather similar.
A quick FR search for “jahi” will give you the info you need. Our own FR medical pros have scientifically and medically explained why the movements are NOT signs of life. Additionally, they have explained why this decomposing body is slowly doing just that.