J.K.
Please, don't try to "fix" your baby... she's perfect as she is:)
I agree with the burping (my boy was notorious!), and keep the slow-flow nipple -- she's VERY YOUNG -- don't rush to "fix a schedule" she is not "made" for apparently. Both my babies ate "off schedule" and grew great.
Books are not people. This time is very short and she needs you to avocate FOR her, not TO her:) If she is growing, has enough wet diapers, and is not crying, she's doing better than I am:)
Don't overthink it -- enjoy this short time for what it is -- milk, sleep and love:)