As already mentioned, coconut or XXL beech chips (reasonably priced, to boot!). Replace the lot once a month. You can't spot clean easily with newspaper - it just spreads.

To scrub & disinfect, a 5% bleach solution (no stronger).

Don't see a problem with bathing her once a week if she doesn't object and it doesn't stress her.

You do seem to have a BP that poo/pees a lot - mine does little for weeks on end! They're all different...