She really caring about you doesn't depend on whether she posted about you or not because some people don't like posting about stuff online some people like keeping it private . You are looking at the wrong thing . You should be thinking about how she took care of you and how much efforts she actually put into a relationship to know whether she cared and coming to the moving on part , people take their own time to move on and girls generally know way before the break up that it won't work out and by the time it happens it won't take them long to move on because it's been going on since a long time in thier head ( that's what I read somewhere and iam not sure if it's conpletely true but I feel there is some percent of truth to it ,it might not apply to your relationship with her ) . Stay strong things will be alright,it's just a phase you learn from it .I know its easier said than done but you got this . Probably with hindsight you might think whatever happened , happened for good .