Y'all are neglecting to mention that she's also a cougar. A smoking hot Cougar. That is very important
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She's only a cougar if your Inquisitor is in his twenties. Not only that but we have no idea how old she is.
On the timeline in the Dragon Age wiki showed that Dawn of the Seeker takes place in 9:22 Dragon. Dragon Age Inquisition starts in 9:40 Dragon it looks like (we have no idea how long the game takes place). So that's an 18 year gap so really we just need to know when she was born or how old she was in the Dawn of the Seeker movie which can be kind of hard with how young some characters can look in animes.
For age ranges in Dawn of the Seeker, I think Cassandra could have been 15 at the youngest and probably 25 at the oldest. So her age can be from being 33 to 43. I'm leaning more towards Cassandra being around 18 myself in Dawn of the Seeker. That way she will be pretty much fully trained as a warrior but still have to learn things from her mentor, Byron.
Cassandra could only be considered a Cougar if you have your Inquisitor be more than 10 years younger than her and have her around her 40s.