One ship wouldn't have to - Since the war was meant to be fought by the early federation (if memory serves) then Enterprise would only be alone for the first couple of skirmishes, and then would have the Vulcan, Andorian and Tellarite fleets at its side.
She could easily not tell the Vulcans - if she believed it would be detrimental to Vulcan's future if the truth about their opponents were known, then the good, logical T'Pol that would never have been killed by Trellium-D would keep quiet. Especially if the link was discovered by her whilst investigating the erratic behaviour of the administrator, for instance... and she and whoever was with her cover up the identities of the Romulans to keep the Vulcans from getting ostracised by their new allies, say...
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