Tricks 2 burping a stubborn baby?

I have a 3 week old baby girl and I haves tried EVERYTHING 2 try and burp her and nothing seems 2 be working!! She burps once in a while and I was told that it was normal since I breastfeed her, but once I lay her down after not burping her sooner or later she throws up! I've tried over the shoulder, over my lap on her tummy, sitting her up and patting her back while supporting her head, bringing her knees 2 her chest, lifting her arms and nothing. Sometimes when I alternate these methods she does eventually burp but most of the time she does not and she starts getting pretty fussy the longer I try burping. So are there any tricks or different ways that work well and fast that can help me? Thanks.