Question, sometimes after breastfeeding, when burping her, she would rub her face vigorously into my…

Question, sometimes after breastfeeding, when burping her, she would rub her face vigorously into my shoulder, chest, whatever... like shes trying to bury a hole. It looks like she's super uncomfortable and I thought she'd stop after a big old burp, but she keeps doing it and kinda fusses as well. Is she tired? Wants to eat more? I can't figure out what it means.