A small C02 like a rat catcher is good for kids, that or a QB78 from SMK (sorry if I got the model wrong, it's the one where you can put in 2 C02 bulbs facing opposite eachother for more shots)
As a few others have said. Buy this and it will last your niece a lifetime. I have number of them, old, new and synthetic stock varieties in both .22 and .177.
Built like a tank, fit and finish second to none, lightweight, easy to cock and fantastically accurate. All I would say is either yourself or the dealer needs to set up the scope, (which is not too shabby to be fair), to suit your nieces eye relief and also for attachment tightness, HW only loosely assemble the scope to the rifle .
https://pbs.twimg.com/media/FMS1elgXsAA50jN.jpg:large
A small C02 like a rat catcher is good for kids, that or a QB78 from SMK (sorry if I got the model wrong, it's the one where you can put in 2 C02 bulbs facing opposite eachother for more shots)
***Proud Member of Castleton Air Rifle Club***
Going to take her along to one of the gun shops at the weekend and see how some options will fit for her.
Depending upon what she wants it for, I would say keep an eye out for a nice Falcon FN12 light Hunter, they dont come much lighter than that, either single shot or multishot if its for vermin control, Multi shots are prone to problems with indexing, but there are good aftermarket magazines available that negate the use of the problematic crown wheel arrangement.