She really needs to love reading to get through an english lit degree. Admittedly, it's been a few years since i graduated, but I had a heavy reading load. 3 novels/books/poetry collections per week minimum, plus background reading and reading appropriate criticism. It's a hard workload.
I would say she doesn't have to enjoy everything she reads though - I truly hated my wordsworth and coleridge module, and barely tolerated some of the set texts for first year!!
Does she have a uni in mind? Perhaps a look at some of their "set texts" would help.
In first year, we covered a broad range of works including Beowulf, Toni Morrison's 'Beloved', Thomas Hardy 'Jude the Obscure', Shakespeare, 'Moll Flanders', 'Heart of Darkness'. I studied Holocaust fiction, Late Medieval fiction, Scottish lit and Elizabethan Tragedy in 2nd year. From those courses, I'd highly reccomend Alaisdair Gray 'Lanark', Janice Galloway 'The Trick is to Keep Breathing', Chaucer's Canterbury Tales (not necessarily the whole thing, but bits of it), Shakespeare's King Lear and Charlotte Delbo's 'Auschwitz and After' - in fact, I'd almost go as far as to say, if that last one doesn't grab her interest in some way, Literature isn't for her!! The subject matter is often unpleasant, but there is something very mesmerising about the way she writes!
In my last year, I studied, English Ghost Stories (nothing stands out from that really), Early children's literature (including Little House on the Prarie and The Family from One End Street), modern children's fiction (including Harry Potter, 'Lady My Life As A Bitch' and loads more) and crime fiction (from Wilkie Collins to Ian Rankin).
I'd say she really just needs a varied interest in reading.
I'd recommend Philip Pullman's Dark Materials trilogy, the Charlotte Delbo, 'Lanark', the Janice Galloway, Shakespeare (direct her to the BBC adaptations 'Shakespeare Retold' which are excellent modern interpretations). Anything she likes to read, really. Perhaps other stuff by authors whose work she currently enjoys reading at school?