You answered it yourself in your question. I think you made the mistake of even responding to some. I dont know the back story of the two of you, or where you are in relation to how long you two have been done for, But I know from experience, that girls on social media (immature ones) tend to do things like that just to see if you’d respond or give them that attention back. It’ll say more to her if you open and dont answer or just get rid of her completely and not contact her. To her she is looking at you as an easy option, and trust me, you don’t want to be an option to someone you care about.