An important thing to remember when using special senses is the education level of the sensor.
Your catfolk's nose can be insanely sensitive, but if she lacks the education to know what the differences between scents /mean/ she's only going to get 'that smells different' and 'that smells the same'.
amongst her own people - catfolk - she can maybe tell a great deal about their condition by experience, circumstance permitting (Scent not washed away by rain, soap, perfume etc;) With other species - especially monster species, not so much, and the shading of scent amongst other PC races are likely very subtle.
