Sounds like things are going well with the feeding, on the whole If everything else is good, it may not be anything to worry about - as others say, she's simply managing that flow and it will get easier for her as she gets older.
Have you tried maybe lying back, reclining in bed or on the couch supported by cushions, etc, and put her on top of you. Sometimes in this position it's easier for them to manage the flow as they're working against gravity.