My t always says I should ask for what I want rather than expect her to guess or offer. So in this case if I had emailed or text that I needed a conversation she would give it, but she won't offer it. I have had several infuriating emails like you describe and she always says how hard it is to connect by email. Every now and then she manages to reply in a way that helps but often I feel more frustrated. These days I am better at working out what I want so in an email I would ask for support or reassurance or a question etc.
I'm really sorry you are feeling like this as it been there and it's horrible. Maybe you need to go over this with her when she returns. I have been caught a bit when mine goes on holiday and in the early days she offered contact, but I didn't know how it ask for what I wanted and it was a train wreck!