My son was exactly the same - school books did nothing for him - we joined the library and went on a Friday afterschool letting him pick the books he wanted - nine times out of ten he went for a comic - he has since found newspapers (especially the sports section) and he reading age is now above average. If she likes cooking get some childrens receipes off the web and get her to read them outloud whilst you cook together - if you know any younger children ask her to read to them (she will feel very grown up!) or play schools and ask her to read to you as the pupil. Good luck and don't worry she will get it in the end!!
I agree with the other answers. It is also important to find out why your daughter doesn't read well. Have you talked to her teachers? She might be struggling with phonics or other reading skills. Ask her teachers for specific advice of things you can do to help her. Make sure you read aloud to her every night. Read something that she will enjoy. At eight she is not too old to be read to. In fact I don't think anyone is too old. This models good reading to her and shows her that you enjoy and value reading. It is also an excellent way to introduce new vocabulary. Make reading a priority and read with her and to her EVERY day without fail. Don't stop when her reading improves.
Being motivated to read at this age can be very simple and at the same time have some complications. As a parent you may be able to tell the difference between her just not liking to read or having difficulties while reading.
If your daughter is struggling in reading, she may not like to read. There are many reasons why she could be struggling. Making appointments with her pediatrician and her teacher are two places to start. Her doctor can check her hearing and vision to make sure she is phonetically hearing and saying words correctly. If she is having a hard time seeing, the vision test will help determine if glasses are needed.
Make an appointment with her teacher. Teachers can administer tests to help determine what area she struggles most in. It may be that she isn't comprehending what she is reading so she may lose interest quickly.
If it is merely she isn't wanting to read, find an area of interest for her. Whether it is sports, animals, Disney or mysteries. There are a ton of books you can either find on line, check out from the library or buy from your local bookstore. Stick with one book for a while and have her read out loud to you. Ask questions along the way to see if she is understanding what she is reading. It keeps you involved and on top of where here skills are. When you feel she is ready to move on to another book, let her choose another but make sure the level is fitting for her reading.
Make reading a family activity. Set some time aside for the family to read for so many minutes a day/week. Reading magazines, newspapers, the comics or books all count. Have fun finding and sharing the information that you are all reading. Instead of reading being a chore for her it can be a leisure activity that you can do almost anytime.
40% of kids find reading a challenge. With early detection you can prevent reading problems. It is great that you are on top of the issue now rather than wait until it is too late.
1) read with her
2) let her spend short time reading for now.
3) get her books on her favorite cartoon characters, that should help build her interest
4) let the story books be short ones for now...no books with chapters for now