In life Cailean struggled with addiction and hurt the people closest to her, now she comes face to face with Death Incarnate and he shows her the error of her ways and then offers her a second chance at life, but at a terrible price.

Death offers an addict a second chance at life, but only if she allows him to take her son.

The logline appears to end with what sounds like the inciting incident. Everything else prior to that feels like back story and setup.

I think re structuring the logline would help it describe a compelling story and create intrigue.

My try:
After the angel of Death offers an ex addict a second chance she must choose between her own life and her son's.

This sounds like an interesting "hook" but it is only act 1 of the film, what happens after she makes her choice?

Also this still doesn't describe well enough what her actions will be throughout the story. Making a choice is not visual enough for film so she needs to have (as previously mentioned) a goal to pursue? Then, what she will do to achieve this goal, will be the main action she takes during act 2.

Hope this helps.

In life an addict struggles with addiction and hurt the people closest to her, now she comes face to face with "death" and he offers her a second chance at life for a price: he either takes her or her son.