I don't know if the used Microchip module supports the ad-hoc connection of two modules. I know that the SSID and channel number has to be identical to allow an ad-hoc connection. As far as I know there is no command on MRF24WB0MA to change the channel so it might be quite difficult to set up an ad-hoc WiFi network consisting of only WiFi Bees. Because Microchip does not release technical documentation for the module you probably won't be able to change that.
Can you change to infrastructure mode?