https://www.youtube.com/watch?v=DHLbed__wRo

The note was a classic Magicians Distraction Technique , deliberately slightly clumsily handling to ensure it WAS spotted

She actually Handed Off something smaller that was held between her middle fingers, like a small capsule , flashdrive or similar , pay attention to the 'sliding wipe ' that Pence does as the handshake ends.

Immediately after the Secret Handshake & exchange she rapidly puts the note back in pocket as her task had been completed

Should any Secret Service have spotted her behaviour and questioned / searched her , she would have been able to produce the ' cover note ' in all feigned innocence and would have said it was a supportive note she had wanted to give to POTUS ,but was unsuccessful

A rather sophisticated Plot and quite adept execution of it - high level cabal planning at play for sure