Is my daughter teething or have a bug?

My daughter is 14 moths just got 3 almost 4 new teeth. She work up with a fever Sunday morning, has the fever off and on for two days , now no fever but she isnt feeling good. She’s been vomiting and not touching any food. ( thank god I’m still breastfeeding , she will only take boob ) she usually eat food three times a day with a few snacks but since sick , only boob. I don’t get why she’s vomiting :( could this be a bug?