There are a few remedies and possibilities here.
1. Have her go bald. You'd be surprised how much odor, urine and tp gets trapped inside those nasty little pubes, even after a shower. While you're at it, you go bald as well.
2. Have her drink more water. I find little or no odor as long as I drink plenty of water. NOT COFFEE, NOT SODA, NOT SLURPEES, BUT WATER!
3. Sometimes that is just how it is with the pussy, especially just before and just after the period.
4. Don't go down after she has eaten certain foods. Fish, for instance, stays with the pussy. I can also taste onions, lemon and garlic in my juices, but those don't really offend olfactorily, and they can be quite pleasant to the palate.