stop letting her string u along with her games,give her what she wants and move on,make her miss u. You didn't mention in your question if you did anything else aside from watching her blocking and unblocking and blocking you again.She blocks me, she un blocks me, rinse, repeat. WTH? baiting the hook and seeing if you nibble. When you don't she pitches a fit and blocks you to show you she's in control, or that she thinks sshe is.
If you're not interested in reconciling why not block her and put an end to her head games?