Thanks but it isn't really a safety issue that is pushing me away from liner locks, frame locks, lock backs, etc. It is more the fun factor. I carried a BM710 (first production knife to have an Axis lock) for 16 years. It is a lot of fun to flip closed. It is also really handy. There have been plenty of times I had work in one hand and my knife in the other - cut, close, pocket, keep on truckin. The whole "path of the blade" was so it could be flipped closed, with less adjustment of grip.
I have a delica and that has a fantastic fidget factor!
You can easily manipulate play with one hand. Food for thought, I have a hard time putting that knife away.
The manix 2 also is very fun knife to use and fidget with.
A little larger than you asked for yet is a favorite in my collection.
I'm not sure your daughters fingers would be strong enough for the lock though.
How you find a good match.