I reckon you'll get as many answers (suggestions) as there are members, as it really boils down to personal preference and how the player uses the tone control. There many many players that don't even touch the tone control, ever. And there are others that like to use it as wah effect (ala Rory Gallagher). Don't know what kind of player your daughter is, but it might be worth asking her how she thinks she'll use it.

My go-to is .033uf (code 333). I find it more useable than .022uf and .047uf. I guess because it's in the middle of those two.
To complicate things further, in a standard 1V 2T strat set up, I've even used two different values for T1 & T2, and I *always* wire the bridge pickup into the tone circuit on any strat.


I would also suggest, if you haven't already, using a logarithmic pot (audio, A type)for the tone control. I started using audio pots for both volume and tone controls a few years ago and just find them more usable.
FWIW, I am a player that uses the tone control. Typically just to knock off some highs from the bridge pickup because I tend to set my amp tone with my neck pickup. But that's just me.

You can also consider a treble bleed which is a whole other discussion. Not all guitars (or pickups) need it IMO, and there are lots of configurations of capacitor/resistor or just a single cap. They can involve a lot of experimentation, or you can just try a prescribed configuration. The good news is, if you don't like it, you can simple snip it out of the circuit. I have some guitars with, and some without, some with various cap/resistor combos, and some with just a .001uf cap (102). It's not always a "one size fits all".