When BB3 first started, I remarked to Mrs Oldgit and a few people at work that Kate could be Kathy Beales' long-lost daughter!
If they made the part around her personality it wouldn't test her acting skills too much. She already has the character traits for an interesting part: Flirty but knows where to draw the line, many of the best feminine qualities but also sports-mad, tomboyish and up for a laugh. And her looks would fit the "East End Diamond Bird" image!
It's a question of whether she can act, and in the long term whether she could make a career of it.
It's also a question of whether she wants to, she may just want to go back to her IT desk, and I wouldn't blame her!