I have all her log cabin rulers and I adore them! I cut out and made a king size top in a week with her ruler! She also has a few log cabin books that are meant to be used with her rulers and I highly suggest getting at least one of them. The key to success is in how you cut, how you assemble and how you press. I don’t know if she still has her class on Bluprint, but she had a class when it was Craftsy called Better Faster Log Cabins and it’s aptly titled! If it’s still available I highly recommend purchasing the class!
May I ask what issues you encountered with you last attempt at a Log Cabin? I’m sure there are many that would love to help!