Definitely call the ABA. Or get a lactation consultant to help. That helped me a lot. It could be any number of reasons. My little girl did the same thing. She could have a sore neck, she could be getting wind, your letdown might be too fast, or too slow. Does she like the bath? Maybe try hop in the bath with her and feed her in there where you are both relaxed.
Sorry I'm not much help. I nearly gave up breastfeeding so many times for the exact same reasons, but she eventually worked it out and feeds good now. I never discovered what the issue was with my bub, but I just offered her the boob all the time to get her used to sucking.