The four digital pianos you mentioned are all in the mid-range of the sector, and they all sound very good.
The difference between the CN-27 and the CN-37 lies mainly in the fact that the former has about twenty different sounds (some pianos and then organs, electric pianos, etc.), while the latter has almost four hundred! (including drums, bass, etc.) -> for a young girl who needs to study piano, the CN-27 is more than sufficient.
Personally, I prefer the sound of YAMAHA digital pianos, which I find slightly "warmer," and I also find the keyboard more inviting to the touch, but those are personal tastes.
However, I also urge you to consider the possibility of finding, for those same amounts above one thousand euros and below two thousand, a second-hand acoustic upright piano that is still "fresh" in terms of age and usage: beyond the correct and decisive mechanical action under the fingers, it is quite another thing to have an object, an instrument, a piece of furniture made of strings, harp, hammers, soundboard, dampers in your home, compared to a computer/simulator, which is convenient and always in tune, yes, but much less "exciting."
An acoustic piano is also a beautiful piece of furniture to see in the living room; a digital one much less so.
In essence, the greatest advantage of a digital instrument would be the ability to put on headphones at any moment, allowing the musician full auditory enjoyment without the rest of the family and the neighbors being minimally involved. A "real" piano, quite frankly, makes quite a bit of noise; its low frequencies spread easily throughout the entire apartment building, and finally, listening to a pianist during practice (which often involves repeating the same group of notes dozens of times) can sometimes be nerve-wracking.