Also, I don't buy houses with active leaks.

And there’s “nothing you can do you went non contingent” .. and she veb said “you can do all the inspections you want after you close and move in” She insisted we either “get a report in our name” from the same inspection company or “call the plumber who fixed the leaks prior” Now 2 days prior to closing agent sent us a disclosure saying we waive all inspection rights - home inspection waiver , wood destroying pest waiver etc. we felt remorse of overpaying in first place and we are not sure if we are making a mistake closing this home with the whole inspection thing.

The first step is stopping the leak.

As the buyer, I'd do a little detective work and do a deep dive on the occupant.

A slow leak has caused $2.5K damage to a rental property of mine.

Kudos to her.I do inspections on all of my properties every three months when I go in to change the air filter, check for leaks, and general cleanliness.

Just keep an eye on the bill and BPT search for leaks, running toilets, and faulty faucets.Good luck

Even in the best scenario you would have spent $1,500-$2,000 to update the smoke detectors and C02 testers, cleaned the carpet, re-glaze the bathtub, update any leaks and light paint and wall repairs.  

Of course its leaking already within the year of it being done.

The most common issue is a leak under the sink or dishwasher.