I have a feeling that it has something to the lack of skin-to-skin contact between you and baby. You mentioned that baby sleeps with the helper at night and that you are a full time working mom. Hence, there is a lack of skin to skin contact. And this could be the reason why she does not associate your breast with a positive experience.
Spending lots of time in skin-to-skin contact with your baby on your bare chest can help to remind your baby that this is a nurturing place to be. You can try sleeping with her on some nights, or on weekends. Skin to skin contact can help your baby to use her instincts to find your breasts on her own. In this way, skin-to-skin contact can take the pressure off both of you.
I hope things work out better for you and baby. Don't give up mommy!
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Mommy of 1 rambunctious superhero