I got the implication, but if she was a friendly Zygon I don't think it makes a substantial difference, and I don't believe in the other possibility.
I don't believe she was a radical Zygon duplicate all along the way Clara was, because if she had been there would have been no need to get her out of the way by sending her to New Mexico, and no reason for the "North America secure" message to be dependent on the outcome of her encounter there. (Unless the New Mexico Zygons are a third group who are also opposed to the radical Zygons, and her call at the end was really reporting that she'd successfully completed her mission to wipe them out. But I really don't think that's where the story's going.)
That leaves the possibility that the Kate in this episode was a friendly Zygon like Zygon Osgood, but if that's the case we're still faced with the same questions we were asking about Human Kate: Has she been replaced by a radical Zygon at the end? If she hasn't, how did she know what a radical Zygon should say?
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I don't believe she was a radical Zygon duplicate all along the way Clara was, because if she had been there would have been no need to get her out of the way by sending her to New Mexico, and no reason for the "North America secure" message to be dependent on the outcome of her encounter there. (Unless the New Mexico Zygons are a third group who are also opposed to the radical Zygons, and her call at the end was really reporting that she'd successfully completed her mission to wipe them out. But I really don't think that's where the story's going.)
That leaves the possibility that the Kate in this episode was a friendly Zygon like Zygon Osgood, but if that's the case we're still faced with the same questions we were asking about Human Kate: Has she been replaced by a radical Zygon at the end? If she hasn't, how did she know what a radical Zygon should say?