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Obviously you know her and her reasons far better than I, but isn't that a bit of a over-reaction? I assume if she has gone to the bother of getting citizenship she wanted to live and work here, and has presumably been here a while. Given the stated uncertainty of what is going to happen, why not wait and see for a bit - it's hardly going to happen overnight and the citizenship she was so happy about getting is still just as valid?
A few weeks ago, a Malaysian working for me got her British citizenship - much excite, so jubilate etc. A few days later, the Brexit vote happened - she's been devastated about being part of what she sees as a country that doesn't want her and greatly concerned about the uncertainty it's caused. This morning she resigned and is moving to Germany. We're expecting to lose a lot more good people because of this.