If that's you're only motivation for talking to her, then I wouldn't worry. There aren't exactly a ton of poly folk around that would misinterpret this.
If she isn't poly, then at some time in the future she may well get approached by a unicorn hunter... so they talk to her, realise she isn't poly and then move on - where's the harm? No need for her to get a new plate, I'd say.
That's if that's you're only motivation... If there were other motivations, I might give different advice...
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