Look, I found that account and all her posted media is marked sensitive. Including one time she posted something that she had earlier retweeted, an article linked by Women’s Place UK. On her account this was marked sensitive, but on Women’s Place UK’s Twitter it was not marked sensitive.
It is clear it is not the material which is behind why it is marked sensitive, as similar material on her account, when posted by other accounts is not marked sensitive.
This is likely because she has, on her settings, ticked the box which said ‘mark media you Tweet as containing material that may be sensitive’. Aka her own choice, and one other accounts, posting similar or even the same content have not chosen to do or been flagged up for not doing.