I agree with some others that if you said you should email her, then emailing her on vacation is fine. My T also allows emails when he's away and also responds--he typically lets me know that he'll be reading/responding to emails once a day (generally in the morning). And he'll make it very clear to me that it's fine to email because he knows I worry about bothering him (well, bothering anyone, really). So I would take your T at her word that emailing while she's on vacation is OK. As my T would say, if she tells you she's OK with it, but actually isn't, then that's on her for not communicating her true feelings, not on you for not reading her mind. Go by what she says.