hypotactic extending verbal group complex of conation:
Here not is interpreted as a formal or written variant of the Finite negative element n't, rather than a distinct modal Adjunct, on the basis that the unmarked Mood tag would be should she? rather than shouldn't she?. See Halliday & Matthiessen (2014: 175-6).
The lexical choice of see adds a 'mental' feature to the material Process.
The additional participant rôle of Behaver is explained by Halliday & Matthiessen (2014: 576, 577):
The extending complex is a two-part process, in which the Subject fills a dual participant role: Behaver (in the conative component) plus Actor, or some other role, in the happening itself.
