This has happened to me lots of times. In fact I sent two texts after my appointment two days ago (one asking about rescheduling) and haven't heard anything back. I think T might be away though and so her phone is off or she just chose not to respond because of being/ rushing to go away. It's a bit hard because we had a discussion in my last session about my reaction to our last series of texts.

We had huge ruptures before Christmas and during the last session before the break I was rushed out the door without so much as a goodbye, after everything it was too much. I did what was okay to do and sent the goodbye in a text (including wishing her a lovely Christmas, said how much she meant to me, how much I'd miss her, and sorry for my part in the mistakes). She replied "that is fine and thanks". Since I was upset about that blunt reply, T's planning on talking to her supervisor and thinks maybe we'll have to have no in between contact. This isn't a boundary I push, and I struggle with feeling like she is still out there, that she is not reachable, that I am filed away. So, I'm right there with you. A reply at this time really would have been quite reassuring.

In the past my T hasn't replied because she's missed receiving multiple texts, had her phone off, and been out of range. Mine also tells me at times that she's not a mind reader. I wonder if yours didn't realise that you would only be reaching out if you really needed contact? I think it's important to discuss this and how it's made you feel abandoned. I really do understand why you're feeling that way.