Why not teach her how to conceal merchandise while shoplifting,
picking pockets and anything else illegal you can get away with:-

No idea about AC but every concert I have gone to at Madison Square
Garden, Giants Stadium, the Beacon, and Radio City has had printed on
the tickets "no photography or audio recording".

The promoters have always had very efficient "security" folks who do a
good job of searching one's person and one's property.

By all means bring a camera if you like. Please do not whine if that is
the last you ever see of it -- you cannot claim ignorance of the rules.

Casinos are much more willing to eject customers engaging in malfeasance
than most normal venues.

Remember, you are infringing copyright if you photograph a closed event
with well-publicized "no cameras" rules. The copyright is owned by the
venue and the artists, like it or not.

So again, bring a camera, and don't whine if someone swipes your photos
and represents them as his/her own -- that's all you're doing.

Now, back in the 1970s people didn't seem to care about concert
photography. I have plenty of photos -- taken with a full-size SLR and a
honking huge lens --  of bands I'd rather not admit I ever listened to.

Maybe it was because the music sucked that they didn't care about
photos...