I'm confused about Lina C3: I got everything up to "Don't use the note as is..." and figured it was referring to the alternate note, but part of unlocking the alternate note is that Lina can't be on C2. The only problem is taking Lina off of C2 means you don't get the prompt to ask for Lin's Panties, so you aren't able to try to open Lisa's suitcase.
Am I missing something?
Don't forget that you can go panty hunting for Hailey! By having Hailey there at C2 minimum, she will text you Friday: Evening as the "Mysterious Text." If you guess that it's Hailey, It will give you the option to give her a code name. Selecting "Family" and "Random" (in any order) will give you the code name "Panty Snatcher", which will trigger the panty hunting mission. THIS is where you'll be able to activate the ability to try to open Lisa's suitcase without requiring Lina to not be C2.
Hope this helps!