Let me start by stating that 8 years old is not too late to catch Dyslexia! I taught high school level history and found many of my students were dyslexic. I myself am mildly dyslexic. The extent of help your child will need fully depends on how badly she is effected. Some small things you can do to help... try printing off or copying assignments onto colored paper. A black and white contrast makes it harder for me to read print type documents. If I print it out on colored paper, it is much easier to read. Some dyslexic children also find it easier to read with their book upside down. I know that sounds strange, but it has to do with how the brain interprets what it sees. If I am tired, I flip my book upside down and am able to keep reading.
There are a lot of small tricks like these that can help her to function without being singled out or made to feel uncomfortable. The most important thing is to find what works for her, knowing that while children with Dyslexia have similar symptoms and similar difficulties to overcome, that each child is also unique and will need their own "treatment" plan put into place.
Your school should have a resource team to be able to assess whether or not she is dyslexic and if she is, how much it effects her. They can also work with her to find what learning styles and methods help her to achieve to her highest potential. For a while it may seem like trial and error, but children with Dyslexia can still excell and do great things with their lives, they just need a little help training them to read and write a bit different than some of their peers are trained.
In the learning process, find areas that are her strengths and praise her for them. The confidence she gains in those areas will help her push through any learning challenges she has.