I doubt it Bob. I think she had her eye on his riches from the moment they met. I just think she's a vindictive little bitch who knows that all you have to do is raise the allegation to plant that seed of doubt in the publics mind.
Having just read "The Beatles" by Bob Spitz, none of the four were angels. They lived and took every advantage of the "rock star" life style and all it had to offer. This broad probably did not know or realize the life style she was about to be connected with. Linda knew, and actually lived that life style prior to meeting McCartney.