Sorry, but therapy sessions on the phone while driving is plain weird. I don't know why she has to drive at the same time. If she's trying to squeeze you in somewhere because she doesn't have enough time, then either she needs to do a better of job managing her time or say "sorry, I can't do it."

Also, I have a hard time with her saying what's adequate and what's not. She's not you; she can't tell you if she is "adequately present" or not. You're the one who has to tell her if she is adequately present. She can't decide that for you.