Full timers insurance no good?

My apologies, apparently about 4 years ago mom was scammed into switching to another insurance company for her RV. She said she got a letter that said her policy was now with Progressive. I've been paying her premiums to National General all these years, but it just looks now that it was only for our cars, and I didn't catch that. All this time I've been confident my mother was covered by 'full-timer's' insurance, but apparently someone switched her RV to crappy insurance. I'll be looking into how this happened, but I'm afraid it is too far in the past to be of any use. I sure hope this doesn't happen to anyone else. She said it happened right after she had a claim for her awning. National General didn't sell her policy to Progressive to get rid of her... I hope.
All apologies, apparently we're screwed.
Thanks,