She blames her assistant for the tweets. Why doesn't her assistant use a Blackberry? Since Alicia is the Global Creative Director you think she should be able to set that up.
Also she's still heavily using Instagram despite it not being available on the Z10. Maybe they shouldn't have picked a spokesperson that's so active with the newer social apps, like maybe Stevie Wonder.
The Apple brand is heavily ingrained in music, art, and other creative fields. Having Alicia Keys switch cold turkey to another OS is asking a lot. Be reasonable and cut her some slack. In time she'll be able to make the full transition to BB10.