This actually makes sense.. It seems young girls would be more prone to be Pooh fans and this will help the marketing by giving them a character they would relate to.
All of disney's fare has been "girl oriented" of late.
There are no real traditionally positive stories oriented towards normal boys. The few stories that are out there are generally tinged with a bit of PC.
I guess it makes sense to include a girl with the pooh series if you want to sell more toys. I wonder if this has more to do with the fact that disney lost a copyright law suit to the owners of the pooh stories.