Well mom, we are all interested in your situation and want to help you by giving suggestions that may/may not help. We sometimes get into predicaments and sometimes when people brainstorm (like here on FRF) we might hit upon a solution. So don't be afraid of asking questions. Just try to make them intelligent?
So let me ask:
In the 1st post, you mentioned that you brought the TT out of storage. From where?
Did you have it covered? With an RV cover?
Was it stored in a somewhat level position? If it isn't parked somewhat level, the rain runoff may have been affected and could get into places that are not sealed correctly.
It's kind of late to say it now, but no matter how the previous owner maintained the trailer, it's yours now.
If you are going to repair the damage(whether insurance settlement or not), you need to find out where the water has entered. The walls will have insulation that will be ruined and will have to come out.
I see a huge endeavor if you keep the TT.