Like others have said, I'd have a talk to her and let her know your concerns about how you feel she is disinterested.

I know yawning is a goofy thing with some people and your t might not even be aware she is yawning a lot. Some say yawning is a way of expressing emotion. I've also heard people tend to yawn more when they have sinus congestion. As for the face-palming, perhaps your t had a headache and face-palmed because of the pain. I'm no expert in yawning (or anything else for that matter!) but what I'm getting at is there are plenty of potentially valid reasons your t may have face-palmed and is a chronic yawner. It might not be you. It would be a good idea to let your t know how this makes you feel and to discuss to get to the bottom of it.

You state you are very depressed so if you find any relief in going to therapy at all, you should consider continuing on with therapy be it with a new or current t. You mention you feel you aren't making any progress, so maybe you'd welcome fresh perspectives and support from a new t. I don't know. Just make sure you have good support in some fashion before dropping therapy altogether because you do not want your depression to get worse.