Just don't panic and offer so much you make her refuse altogether. That's the side we're on now. I'm trying to coax her back and show her mamas boobs aren't scary. I'm doing silly stuff like when she'll let me, putting it in her mouth and squirting milk in her mouth and tickling her or making funny sounds to make her laugh while my nipple is resting on her mouth. Or just talking to her while it's touching her.
I can't say enough to not panic. that's what I did. Esp if her output is still good, don't panic. have you said what her weigh gain has been?