The 35mm in APSC is equivalent in angle of view to around 50mm in 35mm film format. Hence, it is already (or used to be) a do it all type of lens. Why not let your daughter use the single lens for 6 months or 1 year?
Then she will learn if, and what, angle of view she might want to further her photographic endeavors.
The diagonal angular field of view
(AOV) for a full-frame 24x36mm sensor is 63.4 degrees for a 35mm lens and 46.8 degrees for a 50mm lens . The notion that the 50mm lens is "normal" or "standard" stems from the historical fact that for the 1925 Leica I, a 50mm was chosen as the standard for 24x36mm film.
The first Leica 35mm lens arrived in 1930, when Leica became the first camera system in history with a standardized mount and interchangeable lenses.
But since 1925, there has been no trustworthy scientific evidence that 46.8 degrees AOV provides a more "natural" viewing perspective for humans. This whole idea is based on a misinterpretation of human vision. Our field of view is approximately 120 degrees binocularly, with a much smaller central foveal area for sharp focus. A single-lens camera image can only ever approximate this. The 35mm lens captures a wider field of view, more closely aligning with the immersive feel of human binocular vision, including some peripheral information. The 50mm, with its narrower AOV, crops out this peripheral context, creating a more isolated perspective, similar to tunnel vision.
In fact,
the 50mm decision was a marketing decision, not a scientific one. At that time, cinema cameras used 50mm lenses for smaller 18x24mm film formats; fitting this existing well-known lens design to a wider frame was both simpler for lens designers and cheaper for the business, because otherwise Leica would have been forced to create a from-scratch design of a wider lens that covers a bigger frame too early. The 50mm (non-interchangeable at the time) was thus marketed to amateurs as a "standard, versatile, do-it-all" lens from the Leica start. Leica announced its first 35mm lens in 1930, 5 years later, after achieving initial commercial success and having enough money for R&D.
Since then, the debate of "what is more standard/natural, do it all type of lens" has become eternal. We have plenty of historical evidence that some people are more comfortable with 50mm AOV, while others with 35mm AOV, and there is no consensus because it is too subjective.
Photographers who favored the 50mm lens as their "standard", to name a few:
- Henri Cartier-Bresson,
- Robert Capa,
- Elliott Erwitt,
- Robert Frank,
- Walker Evans.
I doubt that they were limited in their choice of the gear to use
Photographers who favored the 35mm lens as their "standard", to name a few:
- Alex Webb,
- Joel Meyerowitz,
- Bill Cunningham,
- Vivian Maier,
- David Alan Harvey.
... and me, too
So my subjective, unobtrusive advice is: get a good, but not too pricey, zoom (for Fuji X, today it is Sigma 18-50/2.8; any slower aperture at 50mm is restrictive). Take your first 10000 shots with it. And do some statistics — how often do you use a specific focal length range? In the FF equivalent, Sigma is approximately 27.5-76.5mm FL and DoF-equivalent to F4.3 throughout the zoom range (so shoot wide open 90% of the time). Your reference points will be (in FF equivalent) 28mm, 35mm, 50mm, 75mm. And you will see for yourself what your "standard, versatile, and do-it-all" focal length is — maybe 28mm?
I have my own speculative theory: why some people (about 2/3 of the mass, I guess) prefer the 35mm AOV.
If your eyes are not ideal (some degree of myopia), you need to get closer to your subject to get a good view. Over the years, looking at the world from a closer perspective becomes an unconscious habit. This is my case - 35mm AOV fits better.
For those with ideal vision, there is no need to go a few steps closer to the subject to get a good view, so their unconscious habit is to see the world from a different perspective. This is my daughter - 50mm AOV (and longer) is her choice, she neither enjoys nor uses 35mm equivalent FL.