Tips for ADD Homework Help Long-Distance?

Another example of a loving noncustodial mom doing her best to stay involved in her kids' lives and supporting their education. It's so great to hear about parents who keep good relationships, but even without contentious battles between parents who've split up, the everyday challenges of education - and in this case learning disabilities - require a lot of work and creativity. This noncustodial parent is looking for tips if anyone has them!! Thanks for sharing... ;)

"Hi! I became a noncustodial mother 4 yrs ago....
I have 2 daughters (13 & 8). I live in Colorado, and they live in NY with their father, my oldest just started High School. I spent July with them out here in CO, the time went too quickly, 4 weeks is not enough.
"My ex and I still have a friendly relationship, and I am friends with his girlfriend on Facebook. I am lucky to have such a nice woman in their lives. I talk with my girls regularly on the phone, and I interact on Facebook w/ my oldest daily -- but they are both busy with school and extracurricular activities.  

"My 13 yr old is struggling in math, and we have devised a way to do homework together via webcams and scanned homework docs that I can print out. I am trying my best to help her there.  As for my youngest, she has ADD, so we are trying to figure out how best to deal with that, as she struggles with spelling and reading. The trouble here is she doesn't like to really talk on the phone, and I have tried to get her to communicate with email, but I think her troubles w/ reading comprehension keep her from engaging in that medium. Even the webcam is problematic for her, and I am at a loss at how best to help her. 

"Anyway, thanks for listening, and for any help you can give me."