You'll also need to educate yourself on the costs of meth remediation (I think it's pretty expensive), and factor "worst case scenario" remediation costs into your financial models. 

Doesn't she have a certain timeframe to remedy the situation?

I was thinking a thick piece of quarter-round may do the trick, but wanted to see if anyone has remedied a similar issue? 

If you know about the water issue, and you plan to provide a disclosure to the buyer, you are most likely required to disclose this fact (most state disclosure docs ask specific if you know of any water or dampness issues below grade).If you disclose the issue, buyers are going to ask what you've done to remediate it, and if the answer is "nothing," that might scare off some buyers.The bigger issue that buyers will worry about isn't the water itself, but the mold that will likely start to grow if the condition persists.Personally, I'd try regrading to fix the problem, so you could at least be able to disclose that you tried to fix it.

There is a pool and a spot in the backyard with no water and a mold remediation letter in the file.

I think going with a mold remediation service is best, not only to determine what kind of mold, but why it's there.

If you are not familiar on what to look for, I would recommend taking a fire and smoke remediation specialist with you.

I had a bid from a mold remediation for $4000 but opted to clean it all myself.Thanks

"Buyer and seller agree that, upon any default by the Buyer, Seller will keep any earnest money as full liquidated damages as sole remedy."

Risk isn't as scary when you have time to learn and remedy any mis-steps.