Regardless of the Netherlands' capacity to stand up to the full strength of the blitzkrieg, she was a strong-willed, principled leader who did her utmost to support her people, even in exile.
My biggest problem with it is that I have a hard time believing they wouldn't pay attention to it in history class with the (arguably too big) focus on WWII in the Netherlands if it really was that much. And I also dislike that she never had any actual power; I prefer to see leaders who used their power to achieve great things. Offering resistence, while certainly being an admirable trait, isn't achieving greatness if it doesn't result in anything (which sets her apart from someone like Gandhi).
Additionally I've also heard a lot of critique on the Dutch government and royal house immediately leaving when Germany invaded.
Eh, I don't know. I feel like Wilhelmina is only considered a possibility because people started mentioning her in the forums a few days ago, and I'd much rather see either William of Orange (who, admittedly, we've seen several times already, which I also consider an argument against his inclusion) or king William I, who brought the Netherlands into the Industrial Era after Napoleon.
Or to name some more out there candidates:
Johan of Oldebarneveldt, who ruled the young Netherlands during the first half of the independance war with William of Orange's... nephew, I believe.
William III, who got the Netherlands through the "disaster year" 1672, when England, France and the bishops of Münster and Cologne all invaded the Netherlands and later unified the Netherlands and England (for a while).
Johan Thorbecke, who, on command of king William II, rewrote the Dutch constitution to avoid a possible revolution, like had happened in several other countries in that year (1848). Shortly after that, he also became Minister-President, which, due to the changes, made him effectively the highest power in the Netherlands (like the king had been previously and still was in name).
I'd prefer them all over Wilhelmina, mostly because I can't think of anything bigger than "giving speeches about courage from London" for her.