TheBatman1234567890 Is she under the temporary protection status or perhaps has a work visa? If so, the terms of the visa might require that she stay in Netherlands to maintain visa status. Granting a visa that effectively allows for full-time residence outside in NL may negate her current visa status in the Netherlands. OP does not explain what the terms of the Ukrainian GF's visa status is, but the Thai embassy wouldn't grant a visa that would cause her to forfeit her current residence.
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Is she under the temporary protection status or perhaps has a work visa? If so, the terms of the visa might require that she stay in Netherlands to maintain visa status. Granting a visa that effectively allows for full-time residence outside in NL may negate her current visa status in the Netherlands. OP does not explain what the terms of the Ukrainian GF's visa status is, but the Thai embassy wouldn't grant a visa that would cause her to forfeit her current residence.