I will tell you what I would tell any parent coming to me to complain about books being read twice if you told me what you have said in your OP. You need to be supporting her reading a LOT more at home. Allowing her to stop after two pages every day or so is not going to promote reading to her, and you are supporting her in thinking it is a chore. You've been lazy in letting it go for a quiet life, and you're going to have to now do some hard work to get her enthusiasm back.
Reading does not need to always be about the books the school gives her, and in fact, you need to be providing other options for her.
Try and find some good chapter books that you read to her. Harry Potter, Roald Dahl, Enid Blyton, anything that will make her want to listen to the story and want her to hear what happens next. She obviously won't be able to read them, but you need to read them to her and get her interested in finding out what happens in the story. I'm currently doing the Faraway Tree with my four year old DS and he brings the book to me every night and we read a chapter before bed. I've found him several times sitting with the book open and trying to read. He uses the pictures to try and work out what is happening in the book.
If there is a topic that she is interested in, then borrow some books of that theme, even if they aren't stories. One of my students didn't enjoy reading, but was obsessed with horses, so I got her to borrow some how to care for horses books and that encouraged her to read them which then extended to the Saddle Club books and other horsey stories.
Also, get her to read everything. Write your grocery list and have her read out the items to you when shopping. Get her to read recipes, instructions, bus signs, everything you see. It needs to stop being a chore and just be a fact of life.
There is also an excellent computer program called Reading Eggs (www.readingeggs.com.au). It is Australian based, and all of our students love it. We have weekly challenges and they get certificates for completing challenges. It all gets quite competitive at our school and we have a weekly award for the student and the class who has done the best. They currently have a five week free trial. I'm sure there is a UK equivalent, although someone there would need to let you know on that one.