Sorry to hear this, if a reservation is made and your on time for it there is absolutely no reason why you should have to check back in 30 mins. Do you know if this was her decision or management? If it was her that took reservation and then flaked out by all means boycott her. But if it is management’s decision that has caused this that’s unfortunate because all you really can do is not patronize the spa anymore and you miss out on a fun experience. Now of course this is my opinion and you know what they say , opinions are like assholes, everyone’s got one!