Did you rip a hole in the channel or did you use one of the little grosgain loops she placed along the side? There are 3 on each side of my quilt spaced evenly along the side. I could probably just use these if I need to add the shockcord. I think I'll try the option you agreed with me on first.
I did not modify the quilt at all, there is a channel along the long edge big enough to slip the shock cord threw. I do not have the 3 tabs along the edge, mine is a older model and she may have changed the way she did the edge. On mine the end channel and side channels are sewn in the very same way giving room for the shock cord to run threw. Try slipping something long and thin into to corner right at the LineLoc to see if the channel is open.