No. An index value of 4.66 32 days after your last sexual contact could be new infection or could be old infection. If you told me two weeks, I would say yes, old infection. But at 32 days, it cannot be determined.
I would wait until she gets tested to know what to do next. If she is positive, you don’t need to do anything differently. She cannot be reinfected with something she already has. However, if she is positive, you can’t know who gave what to whom. Either of you could have been infected for a long time and just recognized a first outbreak. It is also possible that she has been infected for a long time and just infected you. If she is negative, she is vulnerable to your infection. It is also possible that if she has recently had a new partner and just got infected, it could be that not enough time has gone by for antibody to be developed.
What are your feelings about her recent fidelity?