Did my mom get ripped off?

Several months ago my mom bought a travel trailer for 5k. The owner told her she should put a tarp over it or use this waterproof stuff on the roof when it rains. I don't think mentioned any leaks. Well, it rained for the first time like a week ago, and has been raining since. My mom didn't put a tarp or anything over it. We whent into the trailer, and the whole ceiling was covered in mold, and it was leaking in several areas. I feel really bad for my mom, but she kept saying it was her fault because the seller told her to put soemthing over it. So I put a tarp over it, and I examined the roof and there were several cracks on the top, and and there was a soft area that dipped down a lot. Do you think she got tipped off?

Did my mom get ripped off?
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