In the motor trade we had a few ladies (not many) in the new car sales environment. They always seemed to have an advantage as any single woman customer felt more comfortable talking to someone of their own gender and 'single' men customers also tended to gravitate to them (for some reason.)
Despite the advantages, very few suceeded as the hours were long and their maternal instincts usually got the better of them.

For a short time my wife worked with me she was approached by ladies asking us to quote for residential cleans. Most we still do today so they were genuine customers. One especially is a really nice young lady who has recommended us to her friends as she feels totally at ease with us and knows both she and her friends won't be 'hit on'.
As for the wife working with me, it didn't work out. You have obviously got a very compliant GF so this will work better.