Trouble burping

Hey everyone. So I've been having a hard time burping my daughter. I'll pat and pat and pat her back and she won't burp. I've tried rubbing her back, having her sit up for 30 mins, rubbing her tummy.. And nothing. Tonight she spit up a ton of formula and sneezed some out too. I feel awful because I know it's because she needs to burp. Any suggestions to get her to burp? She's only 10 days old.