Joanne Baena is one of the pre-made child townies in Bluewater Village from The Sims 2: Open for Business. She can be made playable by befriending and aging her up with another child [TS2:FT], and sending her off to college [TS2U]. Joanne's relationships with other townies are usually randomized at the start of the game. Her interests are randomized at the start of the game. It is only referenced in the game files that she has no interests.
The game files reveal that Joanne starts off with no School enrollment or school grade. When she is first spawned in-game, she will be a C student enrolled in public school. Joanne's name is randomized when Bluewater Village is generated. The name "Joanne Baena" is only referenced in the game files. She has the same facial structure as Katherine Gregory.