My reaction would be to take her phone and smash it on the floor
Nah, just kidding
But these are not good signs. She's not doing her work when she constantly check her phone or other things that are irrelevant. A therapist focus should be on the client (for those 40/50 minutes). Sometimes when I am in session, the T's phone rings, because she forgot to silence it. She turn it off and never reply or focus on it. She can call or text later, when I'm out of the session. She yawns sometimes, but she always try to dont open her mouth and to stay silent, not making loudly noises. These are all signs that a T respect the client, because the client is going trough hard times, so T should focus on the client, listen to it, even if the client goes quiet, the T should know to be patient, and wait. If you don't feel ok with this T, maybe try searching for others. There are very good T's out there