if you keep her in the correct conditions, you'll never see her, that's how you know she's happy!
Give her as much substrate as you can, she'll burrow like mad.
Mine is in a pickle jar with about 12" of substrate. Lucky for me, she burrowed along the side so I can keep an eye on her.
Mine goes for weeks without eating, but she looks good.
The funny sound is stridulating, it's special hairs that produce the sound when rubbed together.