Adults can be blinded about the fact that something is not the norm. I will go as far as avoid. This is just something we do not do intently. You seem pretty smart so I would look up things on the condition of dyslexia and just have her seat down while i talk about it and have material that she could follow along with. Don't try to say you have it just yet. After she seems to understand then I would tell her "I think I might have a learning problem and I need help. It may not be dyslexia but I know I have a hard time learning and want too so if I could get tested so we at least know what it is then we can find out a way for me to learn". If nothing else she will know you're sincere. You should also see if the local school will pay for the testing. I don't know how you're system works but here home schooling is still under the public school policy and the public school your under will pay for the testing and materials.