Probably because Kitty is obsessed with Belle. She went on and on for years about how she was the "original Belle", people ended up finding her old photos where she looks nothing like how she looks now/Belle and obviously uses makeup, blurry ass photos and photoshop. She also likes to brag about looking 12 while shoving a dildo and cat fur up her vag while her cat climbs her naked on stream. She likely spammed Belle's dms about how she hated her and how she isn't the "original one" (which she'd do in her own posts and stories) and Belle just got sick of the mental illness rants.