I'm pretty sure this is the conversation going on in her head:
MOM-MOM-MOM-MOM! Did you SEE this? Come 'ere. You GOTTA get a load of this...
Dude, seriously? If you don't take control of this situation, I'll be forced to.
OK. Just stand there.
On the count of three I'm goin' in.
Ready? One, two...
Wait, what comes after two?!?
I think it's interesting that she's frightened by it especially since "they" (you know, all the baby expert gods) say that if a newborn is upset try turning on a vacuum (or hairdryer) because SUPPOSEDLY they simulate the noises heard in the womb.
And my baby is terrified of this noise? Makes me wonder, "Damn, what kind of sucky womb did I have in the first place?"