Hi, here's my two cents worth

When the smoke alarm goes off, it hurts her hearing. Those things certainly hurt my ears if I"m in the same room, can't imagine what it does to a dog's sensitive hearing. Too high pitch and to close for her to to howl like many dogs with the noon siren.
Sound gives off vibrations that she can probably feel from the floor. She can't figure out exactly where the sound is emanating, but she feels it from below her. Perhaps, the detector had stopped one time at the same moment, she leapt. Who knows? She's probably usually at the point of "Make it stop!" just due to the pain.
Then to top it off, she's made an association with your oven door opening and the alarm going off. Working with her by opening and closing a cold oven door could be helpful to desensitize her. Although this does give new meaning to "4 alarm chili"

toodles & good luck.