feed for more fizz?

[fayeg1]

Getting fed up with an extremely laid back (on the point of lazy) pony and want something to give her a bit more fizz. Which feed would you recommend?
She's currently on Bluegrass Transform Mix and it hasn't really had an effect.

 

[Silmarillion]

Mine got slightly less than laid back on Alfa A and a handful of oats. The only other thing that even touches her, is fresh spring grass! The fitter she is, the better she is, too.