Looks fine to me... If the issue was medical, i'd have preferred her/him? to be travelling with a carer - but she (at least in the video) was posing no safety threat to the aircraft or others around - so I would have just enjoyed her company (and the entertainment). As for the guy in 'A', i'd move him if I could, or perhaps 'forget' to charge him for that beer he didnt ask for.
To be honest, when you do 5 flights on the same route in a day, the crazy ones are the only thing that makes the day go faster. I would have been happy to have her on board.
If it were a longer flight and she kept going - i'd ask her to keep the noise down and try to be mindful of others space (the guy in 'A' and the aisle), but being a longer flight i'd take the opportunity to have a chat about anything (which in doing so may solve the problem).