Mentally ill friend picking fights why?

An ex-friend who is mentally ill with severe anxiety and depression ends up picking fights with people via a passive aggressive manor so she looks like the victim when she is the instigator.

With me I have been ignoring her for the last month (Zero Contact online/offline/phone etc) and she has posted four facebook posts which have annoyed me and been an attempt to goade me into some sort of fight.

I have just ended up blocking her everywhere as for the last two months I have been trying to resolve some issues with her which she spent a full month ignoring me followed by the last month of this weird stuff.

What I am curious at is why do people like this lash out when I have spent the last month leaving her alone like she asked? I won't get dragged into this, just curious?
Mentally ill friend picking fights why?
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