It's a hard decision. I left a T because of her frequent cancellations (and her therapeutic orientation). I needed more and it's okay to need more... it's okay to want what you want and to give that to yourself.

I'm like you. I need a regular time. My T and I have tried some different time slots recently because I now have transportation so I'm not limited by the bus schedules. In the end I decided it didn't matter what day or time, I just need a regular time that's mine.

Have you talked directly with her about your need and your feelings about the scheduling? (beyond asking to book a few in advance). If it was me I would want to know that she understands how important it is to you and is able to provide for you. It almost seems symbolic; if she can't fill this need, can she fufill therapy needs...

I hope you are able to get what you need and what will be helpful to you.