writersblock wrote:Personally my theory is that Sarah, after the death of Laura and Maddie, and finding out that her husband was the perpetrator of these acts (even if he was under the influence of Bob), left her with absolutely nothing. She became reclusive and found solace in alcohol and cigarettes and not much else.
And she let the darkness in to numb her - kind of like what Leland described when he let Bob inside him.
I don't think she is particularly conscious of it. She's mostly just numbed Sarah - probably thinking the alcohol is doing it's job. But there is something inside her - that comes out from time to time.
We see it in the bar and we see it lashing out at the picture of Laura. Whether that is the catalyst that takes Laura from Cooper at the end of Episode 17 - I don't know, however.
That's my take
I fully agree on your take on Sarah, but I do not think her trying to smash Laura's picture is the cause of Laura disappearing from Cooper. I believe that Laura disappears from Cooper because "the past dictates the future", hence if Laura doesn't meet her fate that night then Cooper never goes to Twin Peaks, then Laura is never in the lodge, then Cooper never can save her (notice how Laura's scream that we hear when she disappears is the same we hear when she is sucked out of the lodge, I believe those two events happen at the same time).
I actually think that Sarah smashing Laura's picture is very related to Cooper trying to rescue Laura: she wants to remove her painful memories but they cannot be removed, as Cooper wants to undo her being killed but that is not possible as well.