The scrap book thing gets me too, but not in the way it seems to be getting everyone else....bare with me for a sec

(lol I wrote sex, but had to remove the x and put the c back on

) Many many times in ctv they state that MM was the one doing the scrapbook. Not from what I read.
I'm going to start calling M.Y 'Chelle' because I don't particularly like using initials to represent dead people
Liz may have been going over photos with her in some kind of 'remember this' moment or prior to knowing certain information may have decided to enlist Chelle's friend in choosing photos.
If I were Liz I'd do a scrapbook for Cassidy of her mommy, something that Cassidy can treasure.
If I were Liz and I knew that not only was Chelle murdered and Jason suspected (even if it was only me who suspected him) AND I knew that MM was having/had an affair with Chelle................
No way would I make a scrapbook for Cassidy with someone who not only was involved with the hubby of my friend but who could be involved in Chelle's murder.
I could not bear to be anywhere near that woman....so I guessimate that Liz only found out when LE arrived to confiscate the computer and because her flashdrive was attached, she had no choice but to permit it to go with MM's computer gear. (which is why it states that Liz gave permission in the warrant.)