I have literally missed entire threads on Kenzie's case, so apologies if this has been mentioned already.
I'm wondering if her IG 'like' yesterday points to motive.
If she and POI were casually dating, outside of the SD/SB dynamic, and he discovered her involvement in that lifestyle - maybe a jealous rage? He then later accesses IG from her phone and likes the Fatherless page. Because symbolism.
*shrugs*
That 'like'/follow has been chewing up my brain, and I don't think it was her - the above is all I can come up for why bother at all, and why that particular page.