Sick Bird?

My bird (atiel) laid a couple of eggs last week and in the past 4 days she’s thrown up twice; once was mucous looking and yellow. She was quiet for a couple days after her last egg but now she seems to be perking up and getting back to normal. Should I take her to the vet? Is it normal for a bird to vomit in that short amount of time? I did catch her eating paint off the wall the other and stopped her immediately so I’m sure she didn’t ingest too much but I’m wondering if that could be it as well. Any advice welcome and thanks in advance.