I’m normally skeptical of anything from this particular source. But having seen many of these tweets myself, I find the story at least somewhat credible. This woman appears to think that she has PTSD - not from the sort of trauma that would meet Criterion A of the PTSD diagnosis, but from people saying mean things on Twitter.
I feel bad for her, and I do not doubt that she’s experiencing emotional pain. It seems unlikely that this is PTSD, as the diagnostic criteria are designed to be fairly restrictive, and Twitter harassment does not appear to meet Criterion A. You can find information on the diagnostic criteria for PTSD here.