Honestly? It's taken me at least 4 years before I've completely settled with Kane so 5 months is nothing...sorry! I think maybe the time is right to add a little something to her feed, I'd be tempted to keep the Calm & Condition and add something a little heating maybe or change her over (slowly obviously) onto their Power and Performance feed. I'm a total Allen & Page fan and Kane is fed a combination for their feeds, currently because he's a bit of a fat fatty he's just on Fast Fiber and I might introduce Ride & Relax but I also add a half a scoop of basic course mix because he's a cob he gets a tiny bit whizzier with the mix added and gives him abit more energy for jumping and XC. Because Star is a TB I'd go careful on the feed changes as they do react more expressively than their fatter cobbier relatives!!

Maybe worth emailing Allen & Page and see what they suggest, I've always had great detailed replies from them regarding Kane's feed.