And her symptoms sound typical for yeast, not herpes -- which does not cause general redness and itching of the genitals. (Herpes sores
can itch -- but without actual sores
, herpes is unlikely.) Monistat and other yeast
medications do not work instantaneously; it takes a couple days for symptoms to improve.
In addition, because your other sexual exposures were condom protected, it is very unlikely you caught herpes.