Why is she singing? What is she doing out there? What's happened?

4 seconds sound clip from the Phantom of the Opera (1943) movie soundboard.

You can hear this line at 00:49:20.651 in the Blu-ray version of the movie.

Quote context

[...]

- She was drugged. There's no doubt about it.

- Now, who the devil would want to drug her?

- I'm sure she over-ate.

- You're certain she'll recover, Dr. Lefort?

- Definitely.

- What am I doing here? I should be onstage! I...

- Doctor!

- Madame...

- She'll be all right now.

- Why is she singing? What is she doing out there? What's happened?

- Please, madame, control yourself. I assure you that...

- Come to the point, Amiot.

- You were seized with a touch of indigestion. As your understudy, Mademoiselle DuBois naturally took your place.

- A touch of indigestion! Why, I was perfectly well when I went on the stage. Why, I was drugged. And you all know by whom. Anatole Garron did it to make room for that baggage.

- Madame, consider what you're saying! Madame, please, compose yourself.

[...]