It's possible it's a learning disability, but I don't know enough about that area to discuss that. But it's also possible that it's not a disability, just a difference in learning styles between teacher and student. We tend to teach in the ways that work for us as learners, and the same methods don't work for everyone.
For example, my DD's learning style is primarily visual and conceptual, which happens to be a match for my own. I can speak to that in ways my DW does not comprehend. However, my DD's personal reactions to feedback are completely alien to me, and I have to step back and allow DW to address those, to whom they are quite familiar. From DD9's perspective, "Dad is an excellent teacher but kind of a jerk, Mom is nice but she confuses me."
It sounds like your go-to learning method is through visual information, and is therefore your go-to teaching method. What Zen Scanner describes is giving lots of audio messaging to accompany that, which would be helpful if that's your DD's default learning mode.
In addition, there's conceptual, or top-down learning, in which the student needs to know how the process works, and why, in order to begin to crystallize the details. Without those concepts, a series of sequential steps are robbed of meaning, and therefore don't get retained. It sounds like you may be starting with the details, in a bottom-up mode. If you can try it the other way, you may see different results.
