I would argue that by macing Shipman she was attempting to get control of the vehicle before Shipman drove off, and that she would have been quite capable of still carrying out the kidnapping - if Shipman had been sufficiently disoriented by the mace Nowak could have gained access to the vehicle, knocked Shipman out with the steel mallet in her bag, tied her up with the rubber tubing in her bag, concealed her in the garbage bags she brought in her bag and driven off the lot in Shipman's car with an unconscious, hefty-bagged Shipman concealed under Shipman's luggage, Nowak's bag and Nowak's trenchcoat.
FL Crimes Code Sec. 787.01(1)(a)
A person who attempts to commit an offense prohibited by law and in such attempt does any act toward the commission of such offense, but fails in the perpetration or is intercepted or prevented in the execution thereof, commits the offense of criminal attempt, ranked for purposes of sentencing as provided in subsection (4). FL. Crimes Code Sec 777.04
Given the language of the law, I don't think that attempting kidnapping is a reach at all.
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FL. Jury Instructions
5.1 ATTEMPT TO COMMIT CRIME § 777.04(1), Fla.Stat.
Use when attempt is charged or is a lesser included offense.
[To prove the crime of Attempt to Commit (crime charged), the State must prove the following two elements beyond a reasonable doubt:]
Use when necessary to define "attempt" as an element of another crime (such as felony murder).
[In order to prove that the defendant attempted to commit the crime of (crime charged), the State must prove the following beyond a reasonable doubt:]
1. (Defendant) did some act toward committing the crime of (crime attempted) that went beyond just thinking or talking about it.
2. [He] [She] would have committed the crime except that
a. [someone prevented [him] [her] from committing the crime of (crime charged).]
b. [[he] [she] failed.]
Defense. § 777.04(5)(a), Fla.Stat.
It is not an attempt to commit (crime charged) if the defendant abandoned [his] [her] attempt to commit the offense or otherwise prevented its commission, under circumstances indicating a complete and voluntary renunciation of [his] [her] criminal purpose.