Those are the coolest little rifles. I was looking at one just the other day. My friend has one for his kids. He put a peep sight on it instead of a scope and the kids have a blast with it.
What kid needs a scope when 25 yards would be a long shot for them? Especially a 6 yr old. Go get it Dad! and Pics, or it didn't happen, lol!
The important thing is that it will fit your 6 yr old. The Henrys and 10/22s are cool but will be way to big for her to have fun with. Get her a 10.22 and put it on ice for her if you must but heck yeah, the cricket for now. It is a good solid single shot and easy to cock.