CTWB's Arrow SPOILER: Is Isabel Rochev actually Slade's Daughter?

This is a technology blog about coding and programming, so I don't usually talk about comics and TV shows here, but I've been scouring the internet and no one else is talking about this, so I felt like I should mention it here:

SPOILER ALERT

It appears that, in CTWB's Arrow three-part season finale, Isabel Rochev (Summer Glau, Serinity, Terminator: The Sarah Connor Chronicles) will be revealed to be the daughter of Slade Wilson, a.k.a. Deathstroke.

Draw your own conclusion:

On the left, Isabel Rochev, the woman who tricked Oliver Queen (a.k.a. the Arrow) and usurped control of his family's company. In the middle, a mysterious figure seen only for a moment during the official trailer for Arrow's three-part finale. On the right, Rose Wilson, a.k.a. Ravager, illegitimate child and protégé of Slade Wilson.

In episode 218, Deathstroke, it was revealed that Isabel is working in conjunction with Slade. In episode 219, The Man Under The Hood, we saw Deathstroke risking his life, and the possibility of Isabel receiving superpowers, by attempting a blood transfusion to save her life. Why her safety would be of such concern to someone like Slade has been a matter of debate by fans, as he has shown no such compassion for any of his other lackeys. Having a blood relation to Isabel would certainly explain things, and it would be in keeping with the comics, as Deathstroke's daughter Ravager exhibits both the same skills and abilities and a thirst to prove herself to her father.

In the trailer for the season finale, we see a group of men wearing Deathstroke's mask from the island; presumably these are the freed convicts who have been injected with the mirakuru (the miracle drug that gives Slade his powers). We are also given a brief glimpse of a mystery woman who appears to be wearing a stylized, feminized version of Deathstroke's current costume. This difference in appearance suggests that she has a higher rank over the freed convicts. Close examination of her features and facial expressions strongly suggests that this is Summer Glau (Isabel) under the mask. Why she would be given a costume so similar to Slade's is a mystery... unless, of course, she truly is kin.

Matt Estes is a software engineering student. His blog, Syntactic Sugar, is about writing computer code that is concise yet easy to read.