Luckily (in a way), she was sick in Australia with a throat infection before we left for Malaysia, prescribed 7 days of antibiotics, we also got the doctor to write a letter confirming what she was sick from and that she was on medication, in case airline staff asked.
She got better as the days went on, however had terrible mucus in her throat which when combined with Milk made her vomit.
The crew on the QF flight from BKK were beyond amazing, they did follow protocol and ask us questions about her health and whether this came on suddenly or not, we then mentioned that she has had this for a while and was on medication, and as long as she remained fine for the rest of the flight they didn't have to call it in.
As it were, once she vomited she had some snacks and water and fell asleep in her own J suite for the remaining 8+ hours of the flight.