I misused the word maybe, I would have chooses "untrusted"... I used a shortcut... my apologizes.
Your examples just suggest that someone working for her has access to posting on her Twitter on her behalf. The Twitter is linked to on her official site, so it's neither fake nor untrustworthy ; it's run by Diamond and her team. It's the most logical source if Diamond had announced her retirement.
So, for the final time, can anyone that follows her on Twitter answer if she has she announced her retirement? I probably could have had a request accepted myself by now...
and if any further confirmation was needed, i tweeted her earlier to ask if she was planning to retire and she responded saying not at all.