Ms. Reed happily was allowed to return to her seat after about 10 minutes and a warning. It was probably a somewhat rude thing for her to have done, and being given an admonition was probably proper (though being removed might have been a bit much). But considering the circumstances and what the film was about -- I'm glad she did it.
And here, you can see why she did. After a very brief ad, this is the (partly-hand drawn, partly-computer generated) six-minute, Oscar-winnng animated short.