Need Help!!. Seller does not want to sell anymore but contract was signed. What to do?

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Hey,

I need help, I've been trying to purchase this property for almost a month, and now that we're set to close the seller does not want to sell anymore. We signed our contracts about a month ago, this week after the seller's REA said that the property had no liens, the tittle company found one. I told the sellers REA that it's okay, I'll handle the lien my self after closing. The REA created an addendum stating that i'll take care of the lien but now the seller does not want sign it or close and wants to cancel everything. Is there anything that I can do to force her to sell me the property. I know that there are laws that will protect me from her breaching the contract. The issue is the our contract expires this upcoming week. The property is a condo, so we're still missing approval of the association, does that force the seller to extend my contract by law. I paid the association extra $ for them to have the association approval before the contract due date, but I can tell them to delay it on purpose. I have to move by the end of the month where I live, and i need this to go through. I need suggestions on what to do? Has anyone dealt with anything similar? 

Thanks