She had a vague memory you had a retreat, but said she didn't write it down.
Maybe the call was more about checking to see if it was okay for her to take care of her own needs during the mid-afternoon rather than checking up on you. I mean, it would be inconsiderate for her to leave the office and then have you show up three minutes later or even to go off doing her own thing if you were at your retreat and something had happened that made you feel the need for your T.

You were fine and she probably went and did something for herself, without burdening you with her own stuff. She probably was checking to make sure she wouldn't be letting you down.

She sounds caring. If it bugs you ... you know the spiel .. talk to her about it.