I would just ask if she has an email she uses to correspond with clients. You could just ask generally. She will either say yes or no. If she says yes, then she will give it to you, if no, well, then she must not email clients and only use phone calls to communicate. I've seen both kinds of Ts. The one who didn't email just didn't have a public email that she shared with clients. Good luck having this conversation. I don't think that emailing you T is necessarily the "norm". I think it just depends on the T.