She was a big Metokur fan and called in almost in tears when he was retiring a couple years back before he returned, so that's where her enjoyment of lolcows comes from as she knew people like Kirsche and by extension him. As for the emote, she was also big into 4chan like many vtubers so it most likely carried over from there as opposed to being some kind of intentional dog whistle. Sometimes bad things carry over and lose their meaning in translation, like how the Crip Walk went from some kind of gang symbol to a Fortnite emote.
You're wrong on this, she has never said she was 3 years old and specifically denied it. She said she was "3" and then said it specifically didn't refer to years and each year she added another 3 to the number and is currently "3.33.3" even making a joke that her age is an IP Address almost. It's just nonsense lols so random humor, not some kind of dog whistle.