If I'm going to base it out of the anime's I have then I suppose it'd be prudent to describe it's extents in there.

As far as the largest single object she has created or at least the most massive then it would be a cube of concrete bout a sixth of a city block a side.

As to how far said objects can spawn away from her. None seemed to spawn further than about about 400 meters or a quarter mile.

As far as how complex, She was able to make modern aircraft as well as a microphone, although a vast majority of the things she's made are simple objects as far as composition goes.

As to her sustainability. While she can do superhuman feats and have superhuman stamina, her ability seems to fall off in about 2-3 minutes of serious and constant usage and ends up giving her a sore throat and possible loss of voice... Cough drops help speed up the recovery process from what I can tell.

As to spawning something that's not physical, there was a point where she spawned "force" and caused a pressure wave, but aside from that single instance it didn't re-occur in the anime.

As to numerical quantity of things she spawns, It seems to only be limited by her sustainability. She can have LOT's of things spawn.

As to living things... No, not one instance of her spawning anything that one can consider conscious, living and or sentient happened.

As to how long said objects she spawn lasts. There are times when they disappear after a while and there are times when they stick around for longer. Those that stuck around for longer included a microphone, a wall, and a swimsuit.

As to moderation, She's unlikely to go overboard on something. Against a delinquent mugger, a handgun... Against a hundred meter tall golem, a bunker buster bomb. Think Alice from touhou, just enough to get the job done.

As to how to method of spawning. The long way is to describe in detail what to spawn... The shortcut way is to "lick" an example of the object to skip the description bit. Which realistically means she must have indeed licked a grenade at some point...

That's about as defined as I could describe the extents of her ability as displayed in the media available to me. I'd keep within this limits if that's alright with you.