The Good Wife

Is anyone else watching the Julianna Margulies TV show The Good Wife?  

As I was watching the last episode my "TV gaydar" pinged. There was a moment during the show when Julianna's character Alicia Florrick got a message on her phone that her associate Kalinda Sharma (played by Archie Punjabi) called, so Alicia phones her back. When the phone is answered with a gruff Yeah, Alicia asks if Kalinda is there... then Kalinda answers and when asked by Alicia who the previous person was Kalinda says "Donna" and there's this ever so slight and quizzical expression on Alicia's face.

Anyway, it got me wondering who Donna is and whether or not Kalinda may turn out to be a lesbian (or bisexual) character.

If anyone else watches the show and knows more, I'd love to hear your answers and/or theories.