.... The D5600 is a tiny bit heavier (465g vs 395g). ....
The 465g figure is with battery and the 395g figure is without. The Dd5600 without battery is a negligible 20g more at 415g(I initially thought 5 grams but was wrong).
D5500 and or D5300 are also two more cheaper D5xxx options to consider.. Depends if wifi/bluetooth connectivity is important or not.
About a year (or just a bit more) ago I was looking at a similar situation. Daughter liked to use he little camera, predominantly close ups, macro-ish level images. No specific subject, simply whatever subject came to mind, she seemed to be more interested in getting closer up.
I got her a neat little Samsung Galaxy Camera as a pressie one year, and she loved it. She loved the ability to do in camera playful processing, and real time processing using the various filters .. just like a phone, but she didn't want or need a phone(she already had one!)
Galaxy Camera was perfect for her requirements .. except macro, or close up shots.
Gave her my D70s, put 105VR on for her and she loved the ability ... just not the front heaviness of the lens. I think 60mm would have been too short for her, so considered getting a smaller macro 90-ish mm Tamron type lens for her and a D5500 to go with it.
But she lost interest not too long after. I got her a new model phone(phone plan was up for renewal so got phones with the new plan) .. and once again she just prefers to use the smaller phone type camera nowadays .. Oh! and she's much less into imaging now and more into texting(or whatever it is that 15yo girls do on the phone now!
And I wouldn't be overly worried about something like the tilting screen breaking either.
I found out the pleasant way, that kids can be more respectful with property than we tend to give them credit for.
Son usually gets D300 and whatever lens he likes if we go out and we're all taking photos. 99.9% of the time he prefers the kit 18-105VR lens due to it's all in one ability. From what I know and seen of this lens the rear mount being plastic is very easy to break, and I've repaired a friends twice now. She says that it drops onto very plush carpet and it breaks(with a D90 mounted). At least they're easy to replace, but knowing what I now know of this lens on a light body like a D90, and that my son usually takes the D300 + 18-105VR on school excursions and camps .. I'm amazed that he has never broken it!
I'd dare say it's probably not going to be an issue.