According to People, Tia's going to star in CSI: Miami and the episode in which she's going to make an appearence will air in October, 2009.
I have been to waiting for more information about Tia’s role but nothing’s come out so far, I’ll update this post when I have more information.

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Edit: The first picture of Tia in CSI:Miami and the episode name have come out. She's going to appear in the episode "Bolt Action" (8x03).
I'm not quite sure this Twitter is really Tia's (I think it is but I'm not 100% certain of it), but if it is, she said her boyfriend on the show looks like her nephew, which means he is a lot younger than she is.

Here's the episode sinopsis: Season 8 episode 3 "Bolt Action" - Three volleyball players mysteriously drop dead on the court while Calleigh's testimony against Delko threatens his future as a CSI, on CSI: MIAMI, Monday, Oct 5th(10:00-11:00 PM, ET/PT) on the CBS Television Network.