Maybe a bit. My t doesn't schedule via email, but I also am aware his does not even have his laptop out and on during the day. I suspect he checks emails and does paperwork once or twice a day rather than spending his brief time between appointments on his technology. He uses that time to handwrite notes, go to the restroom, perhaps return a quick phone call. It is likely she has had clients all day and will get back to replying to emails once her client load is over for the day. My pdoc doesn't return calls until the end of his client day unless it is a real emergency either, so just realize not all therapists spend their time between appointments answering emails and texts; they may have a routine of doing that a couple of times a day rather than constantly throughout the day. If that isn't okay for you, and her part-time schedule load seems a problem for you, you might need to find a T with more time availability for sessions.