What about Dinah Senior?

I’m kinda wondering about Dinah senior and if she will return to the show in season two. She really should-I mean, she has spent the last five years searching for Sara and if she learns that Sara is alive, I’m sure she will return to Starling city in a flash! And if the writers can't let her come back (maybe because Alex Kingston isn't available), they should at least somehow make us understand that Dinah has been informed about Sara. If they don't, it will feel like a poorly executed storyline.

I'm also wondering whether Laurel and Dinah are keeping in touch, like they said they would. It seems to me that it would be natural if Laurel turned to her Mom if she feels that the world is crumbling around her.