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I got a tenant who rent my condo who is under 2 year lease. roughly halfway on the lease (under 1 year) i offered my condo to her for sale. because she been asking if my unit is for sale last year. suddenly she give me email which said that she already found and buy another condo also request on early termination on lease and requested her 2 month deposit back because i want to sell my condo) under my tenancy agreement there is agreement that new buyer will honor and buy the condo as in tenancy agreement (selling the condo with the tenancy as per agreement) . right on the 1 year she moved out from the condo by herself and surrender the key to my agent.
by right if tenant request early termination by herself mean the deposit will be forfeit right? however she threaten me to lawsuit and demand her full deposit back (2 month worth)

what i can do for this problem?