In chapter 70, Frostface tells Moonpaw to come back to Riverclan camp before the storm hits. He said that he didn't want her to catch a cold. Of course, Moon didn't come back before it started raining. In an earlier chapter, it's revealed that Shiningstream has plans that involve Moonpaw. Probably evil plans. Since Moon seems to have fallen rather far into the lies that Shiningstream tells her, and seems to be decently connected to Starclan, she's the perfect candidate to help Shiningstream. This is not a good thing. The fact that Frostface mentioned Moonpaw getting a cold specifically makes me feel like he has a vague idea about what might happen to Moonpaw. I think that Shiningstream was trying to manipulate Frostface before or at the same time as Moonpaw. I think that Frostface saw through his lies though and stopped helping Shiningstream. I think Frostface knows about Shiningstream's plans or Moonpaw, but like Moonpaw with Tansypaw, is afraid to tell her. So I think Moonpaw might die of a cold or something else related to the rain like maybe the river overflows and Moon drowns. Since Moon hasn't done anything specifically evil in her lifetime, she would end up in Starclan. Laurelwing or Goldenfur might try to stop Shiningstream from bringing Moon into Starclan, but will probably fail.