Throwing up after feeding! 😕

Once a day for past 3 days LO has thrown up after breastfeeding. Like enough that I have to hold her over a sink because blankets can't catch it all. She still doesn't cry or act fussy at all. Pedi called her a happy spitter. Stuff is even coming out of her nose when she throws up. And it's mucousy too. Should I try to feed her again right away? Is she getting too much and her tummy is overflowing?  Is it something I'm eating? She feeds for 6-15 minutes. Depends on how full I am and how fast/hard she sucks. Help! Am I doing something wrong!?!