Answer:
Is it unethical to produce a consulting report that steers a client toward a specific outcome?
Yes.
Would she be ethically sound to urge reconsideration of such a decision? Yes.
Explanation:
Producing a biased consulting report aimed to drive the client to a specific decision is definitely unethical, even if this action is aimed to make sure they get the best option for their security needs.
The ethical course of action would be to provide an honest report and to ask for the client´s reconsideration in case the client prioritizes cost reduction over the project’s security.