The RSPCA has confirmed it will appeal against a High Court ruling over a legacy worth about £2m.
Christine Gill last week won a long court battle against the charity over her parents' home, the 287-acre Potto Carr Farm in North Yorkshire, which was left to the RSPCA in her mother's will.
The court accepted Gill's view that her father had coerced her mother into making the will before his death in 1999, and that she had received repeated assurances that she would inherit her parents' home.
A spokesman for the RSPCA also said claims made in The Times and on websites that Gill had offered the charity three quarters of the estate more than two years ago were not true.
He said Gill had offered the charity a small amount of land, which she said was worth three quarters of the value of the estate, but the charity believed was worth significantly less. She had also offered the charity £300,000 to drop the case, he said.
The spokesman added that the charity had offered Gill £650,000 plus costs to drop the case – more than she would have been left with if she had given up three quarters of the estate.