Her 'comeback' tweet ("...whatever happened happened nearly two years ago. It was horrible for it to become public last week, but I have had two years’ worth of incredible help and support...") muddies things a bit for me, because before that, I thought there was a chance she was blindsided and he'd somehow kept this from her - I know that seems impossible but I thought there was no way she would engage in threatening behaviour online with him (see timeline below) when he had this hanging over him, knowing it would be coming out - you'd make some efforts to keep a low profile, surely?
Timeline-
Nov 2018: He's arrested
Oct 2019: After Sali Hughes posts her video about "trolling", India publicly asks her if she knows where Tattlers live because Eric wants to go round and sort them out - so she was definitely still with him then, a year after the arrest.
11 June 2020: News of his arrest finally comes out. IK tweets something benign, kind of acknowledging it but not giving much away (since deleted so I can't remember specifically what she said).
19 June 2020: IK twitter comeback. Her and Eric still follow each other and it doesn't *seem* like she's left him.
Whether he is guilty or not remains to be seen, but a) she has known about this from the beginning and b) it appears they are still together. There's only a small number of different conclusions to draw from that imo.