Did anyone have any ideas what the little bee was doing in the photos from two weeks ago?

Bees sometimes gather a number of different materials from leaves, including water, resin or sap. Because the plant is infested with lace bugs, which produce honeydew like aphids, I suspect this bee was licking honeydew from the brittlebush leaf. It is likely an example of an insect often considered to be a pest supplying the needs of an insect considered to be beneficial. Isn’t nature wonderfully complex?