There's few things. First, it's Sundby's case. He tested positive twice and basically all this was covered up by FIS and NSF. Once it really came out he got 2 months ban during summer. Well you know, August and September are months with most of races in xc ski racing, so that ban really hit him hard. Few months later Johaug tests positive for steroids, which should automatically grant 4 years ban. NFS and Norwqegian sports fed. first issue 2 month provisional ban and everyone jump up. Mostly because how they handled (and covered up Sundby's case earlier), so on the end she got 13 months, which would cost her one season but make it perfectly possible for her to be back at Olympics (probably winning everything). And due all the bad press FIS got on Sundby's case, I believe they decided to show they don't let Norwegians do whatever they want, so they went to appeal.
Now is she really guilty or not? I guess there's no doubt. That "innocent" lip balm has huge doping warning sticker on box. I mean you can be blind and you still can't miss it (check this and think you are team doctor or pro athlete who knows what you should take care of, and then tell you didn't know it could be problematic
https://goo.gl/8v2YAE ). Was it really just this or is this coverup for something else is left open. Levels in her samples were low, but nowadays noone is going for huge doses anyway, so low levels can be anything... really just lip balsam or "normal" microdosing doping stuff. And imagining these guys are clean is simply naive. So in my mind, 18 months is actually once again double standards which are so common in today's joke of anti-doping system. If she would be from anywhere else then Norway (especially if she would be from Russia), I'm pretty sure we would be talking now about how easy some dirty doper got away.