Not sure I'd consider the A45 any more exciting than the TTS tbh. Which I know will upset Colin, so YMMV etc
Why doesn't she like RWD? If an FWD scrabble wagon terrifies her then I'm not sure you're going to do any better with anything that quick regardless of driven wheels: Our Scoob is 4WD and only 320bhp, but regardless of the 4WD it's still a proper handful if you're not on it. Any modern RWD car will come with TCS anyway, so that'll kick in if you do anything really stupid.