Hi Social Butterfly:
I think the thing to keep in mind is that for a dyslexic to 'keep up' they're effectively working 20-30% harder than 'normals'. So although you want to help at home and work on things, you have to recognise that it is a marthon and that your DD also needs rest and relaxation as well.
My two DDs clearly aren't dyslexic but my DH is severly dyslexic. He is absolutely exhausted at the end of a working day and finds that down time, doing things he's good at and enjoys is more beneficial than just carrying on with work. He's a fantastic cook and he enjoys playing video games with our DDs and reading stories with them.
It may be best to identify where learning needs support and work out strategies to assist learning. So if subtraction is causing the problem, maybe set yourself a goal that you'll help with subtraction of 1-9 from numbers up to 10 up until the new year. You can sneak learning in whilst cooking - Can you get me 10 carrots. Actually I think I'll use two less than the recipe ask for. How many carrots do I need? Use buttons or lego pieces - place a pile of 10 shells on a table, ask her to take 2 away and then count up how many are left. Talk about the patterns in -1 and -2, etc... helping win little battles, will gradually help win the war.
Talking about things is the key, get your DD to be open about what she was finding tricky so you can understand where the problem is, possibly help or certainly ask for help also is time spent helping. Point out famous people who are dyslexic to your daughter. This will reassure her that dyslexics succeed.
Try to find things your daughter is good at. It will help so much for her to know that she finds something easy, enjoyable and is excellent at when other things are a struggle.
The final thing to remember is that something seems to happen at puberty and things often 'click' for dyslexics. It's a long game - so hang in there. If it is any concellation my DH couldn't read until he was 13. His first book was I Claudius (he was wild about the Romans and it was on tv at the time). His mother wasn't sure it was appropriate, but daren't stop him. He now reads anything and everything and quite honestly retains so much more detail than I could ever hope to do, and I was reading beautifully by 8.
Slow and steady can win the race. Honest.