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There is no specific form available. It just has to be a simple letter. Here is what I would include below. I would have her sign this before a notary who can ID her.
I also recommend that you have a lawyer do the final transaction to make sure that the deed is properly filed, in which case you could have him or her review your letter. Here are the key points to include.
Re: Consent to waive rights under contract dated xxxx for deed to property with the address of xxxx
I, [insert her name] do hereby consent to the sale of the property with the address of xxxx, and waive all rights and interest thereto.
Notary Signature and stamp