I believe she said she was composing a party invitation. What she wrote on the practice note was "Mr & Mrs Ramsey".....
The actual ransom note began "Mr Ramsey". I believe as they concocted the coverup, in order to make it look like someone was targeting John Ramsey, the ransom note was addressed to him alone. In real life, a kidnapper would never even write a note with a formal salutation like that, nor would it be over 3 pages long. It would be a few sentences. "We got your daughter. Tell anyone and she'd dead. We'll call. "And that's about it.
They would NEVER identify themselves as a "small foreign faction"- for that matter, foreigners would not refer to themselves as "foreign".
For those new to the case, there is information about the ransom note here:
http://www.acandyrose.com as well as much more information on the case. Take your time with it. There are hundreds of pages, but you'll find the links to the ransom note fairly easily.