How about adding a tiny bit of ambiguity (or evasion of the direct question) and making up for it with more effusiveness, eg, "it's not only my job but it feels really good to know that I'm helping you so I really want you to bug me about even trivial-seeming things!" All true and all she's omitting is her immediate annoyance but that is truly secondary, as she points out below about first-order vs second-order desires.