Hiya, well antibody test are 99.9% accurate, but they are prone to false positives for some people and thats why they use another test to confirm their status.
The cd4 count in a normal healthy person is from 600 - 1200. Its when it gets below 250 that the person is at risk of infection, so your partner is well within the normal range. Her viral load is somthing that would be intresting to see?
Indeed a WB test would give a better idea of whats going on and if possible a PCR RNA test to check her Viral load. If she takes a combination of these tests or just the WB test we can see better whats going on.
Like i said i dont want to give any false hope here, but in my opinion, she has not been correctly diagnosed.. fingers crossed for you both