how to get a better latch?

Samantha
I'm a first time mom and EBF, but when she first latches on it hurts so bad it brings me to tears. It goes away kind of after a few seconds and occasionally she'll bite down in a certain way that spikes the pain again. It only seems to be getting worse as days go by though. So I was wondering if this is a latching problem? And if so, how do I help make her get a better latch? 
The lactation consultant in the hospital just told me that "I'm bigger than her, so MAKE her get a better latch at first", but how the hell do i do that? Not really the best advice in my opinion. :/ 

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