Wanting for her therapist to do an act is exactly what needs to be looked at though. The desire to control is perfectly acceptable (the realisation of it, not always), but this is exactly where he should be working with LT. If he doesn't want stuff in his office, that is his business and his preference - it should not be the focus of LT's attention and he is facilitating her to get distracted by that aspect. He should be working with LT's desire to control, not trying to counter it or reassure it or any other accommodation of it. Be interested in it, explore it, uncover the meaning of it.