Most Helpful Girl
She is erasing the memories you both had together so she no longer has to look at them and/or she's wanting to look available on media. She also blocked you ( more than likely ), because she's moving on and doesn't want to be reminded of you, see your profile, or have you see hers.
If she is with a new guy, move on. Date other girls. Get your confidence back up!
she's actually doing you a favor and forcing you to let go.
Most Helpful Guy
I'll be straight forward with you. She doesn't want anything to do with you. Nothing you can do to change that. You have no choice but to either be bitter she resentful or move on.