Would she be motivated by any of the workbooks at Smiths, etc? e.g. Enchanted English, Letts English, etc. Could you devise a programme whereby if she did a few pages a week she got some kind of treat?
Also, is she reading lots of different types of language? Can you use, for example, some of the election propaganda that will be coming out for the referendum to show her persuasive language? (maybe even tape and watch some party political broadcasts).
DS's class have a list of "banned words" e.g. big, small, sad to force them to think of more creative ones. Could you brainstorm some similes for those every so often, maybe using a thesaurus if you get stuck.
Michael Rosen also suggested, at a talk I saw, taking a poem such as "Owl and the Pussycat" and get a child to fill in the blanks with their own version. e.g. to identify and practice adjectives, go through the poem and find them and personalise them. Would she have a pea-green boat or a different colour? Would it be a beautiful boat, an attractive boat, a scary boat, an awesome boat? Help her see that the choices she makes could really change the tenor of the poem, maybe doing it a few times to make it different each time.
The Owl and the Pussy-cat went to sea
In a beautiful pea green boat,
(what would hers look like)
They took some honey, and plenty of money,
Wrapped up in a five pound note.
The Owl looked up to the stars above,
And sang to a small guitar,
(is her guitar big, small, magical)
'O lovely Pussy! O Pussy my love,
(is her pussy lovely or terrifying?)
What a beautiful Pussy you are,
(..?. pussy)
You are,
You are!
What a beautiful Pussy you are!'
(..?. pussy) etc
You could also play around with interviewing the characters. Why did you go to sea? Why did you wrap honey in money? Why did you sail at night?
Or look at a picture, and first brainstorm a list of what you can see and then of how it makes you feel. e.g. a cockroach might be brown, shiny, like an insect, on leaves, with legs, etc. It might make you feel scared, creeped out, wondering how it got into the house, etc. Don't use furry animals - too cliched - get really weird and wonderful pictures.