Does baby HAVE to burp?

Lauren
7 weeks old. SOMETIMES no matter what I try, she will NOT burp! I try for 10+ minutes and either she is too sleepy or she just spits up instead of burping the whole time I try. 
I try holding her over my shoulder, chest to chest, over my knees, sitting up, football hold, I've tried the "lay down-sit up (repeat)" trick... Nothing works! All I get is a messy baby from all the spit up and TONS of laundry! 
Any thoughts, tips, or anyone else in the same boat?! 
PS- She is not fussy, is gaining appropriate weight, and has plenty of wet/dirty diapers. 

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