It reads to me that the key issue was that she had an invalid visa

She then started recording on her phone rather than just deal with the problem or accept the decision

It would look to me that the being intoxicated was just an add on to the whole thing - which given the alcohol reading seems to be in no doubt

Go to any country and need to follow the rules - she wasn't forced to drink alcohol on the flight and 0.04 suggests more than 1 complementary ( or even complimentary ) glass of wine ( or a very big glass )