What kinds of stuff are in her fur?

A bath every 2 weeks is way too often.

If she gets yucky from pottying can you slightly trim the hair around her anus & privates? Even a little trim will help a lot.

Brushing will keep her pretty clean.

If she just smells how about a gentle doggy calogne? Or just a quick wipe with a baby wipe?

They make products that help repel dirt, debris, urine, feces, etc.... on dogs. They are almost like armor all for your dog. lol They work great!
Some names are:
The Stuff
ice on ice

There is another brand that I love but haven't seen in about a year it is called something gold or gold something, I have a tiny bit left in a bottle at home I'll have to remember to check it.