Our Buyers offer Fell Through (10/19/17)

On Thursday evening we found out that our buyer no longer qualifies to buy our house!  Not the news we wanted at all!!  She had her title work done and a $40k lien came up against her.  She would have to pay that lien and so she no longer qualified to pay the amount in the purchase agreement. She was able to qualify for an FHA loan for $15k less that our agreed amount, which is what we are thinking the 2nd appraisal was for - but we didn't want to take $15k less.  Our realtor called back the 3 people that originally had requested showings but we cancelled once we got the offer.  Two of them were still very interested and wanted to come on Saturday for a showing.