This to me sounds like he is saying - she either
a.) Was to drunk to have remembered clearly
b.) did not clearly articulate herself because she was drunk and is not sure if she is clear
I am saying that her words would commonly be interpreted to mean - she was very clear and his interpretation is most likely wrong - due to the fact her phrasing is common place and most other people would understand it to mean that she was saying a few swear words & was very clear.