Seller backs out day before!

[Timothy E Sullivan]

    I was getting ready to leave work to wire the money the day before closing on Friday, and I got a call from my realtor saying that the seller has to come to closing with $7,000 and she said she doesn't have the money.  After talking with the realtor some more my thought is to threaten to take legal action against her. Or she can bring the money she does have and I would cover the rest.  I don't understand how we could get this far in the process and the day before closing they kill the deal and just tell me thats how it goes!  How does the sellers agent get away with it with no consequences?  As a buyer they dig so deep into your finances, and one little thing that looks odd to them they ask you 20 questions about it, but they wait till the end to see if the seller is in good standing?? Is there anything I could do?  I saw some other post saying you can put a lien on the property.  Its a good deal in the area i'm in and I hate thinking that the deal is just gone!  

    One last rant!!  I don't understand how people can have all these legal documents and still can back out!  The sellers agent is not returning any phone calls!  Honor is of the distant past!!!! 

Good night.