She doesn't look like the 'usual' Paul Kidby Granny no - she looks more the Miss Jean Brodie type
(some resemblance there to Maggie Smith)
With the shepherd's crook maybe she's Granny Aching come back in some kind of supernatural event - which may account for the black as she didn't wear it in life either I'd say...![Er... what? o_O o_O](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Miss Tick maybe?
![Laugh :laugh: :laugh:](https://www.terrypratchettforums.com/styles/default/xenforo/smilies/emojione/laugh.png)
With the shepherd's crook maybe she's Granny Aching come back in some kind of supernatural event - which may account for the black as she didn't wear it in life either I'd say...
Miss Tick maybe?