It's great that she's coming back a second time to do the finale.
Although what Tori did was a pretty low blow, Shannen has a habit of rising above things like this and she always says she will never speak out about her co-stars. She's kept to that for years and I believe that she will continue to do so.
I've actually only seen a few little clips of her in the new 90210. Can someone tell me exactly what eps Shannen is in, so that I can download them? Thanks! *squishy hugs*