if you dont control your fairy you are bad.
Imagine that: you dont control your fairy, she blow all her cds as the fight start(yes she will), after 30s everybody in your group take dmg and you'll have to spam succor alone cause all your fairy cds are off. If the fight is intense you gonna wipe your group cause you sucked.
leave your fairy on steady 100% of time, place her IF needed(90% of the time) and blow her cds when YOU see fit, not her. Pro tip for that: when you need to blow her cds, heel(if need)>rouse>fey illumination> she'll use whispering down on her own, after that you have 60s to put her on steady again, but make sure to not rush cause if you steady her before whispering down is totally off animation you can get the CD and the skill wont go out. its like those instant skills with long animation, if you cancel you'll get the cd but no effect.