since she is almost a year old, i would say 3 times per day would be good...in the event she does not scarf it up immediately (which mine do - you would swear they never get fed lol

) i would not leave it down any longer than 30 minutes
i believe you can put the unused portion back into the refrigerator for that one day but i would not use it the next day
hope that helps!
ETA: mine eat at 6.30am, noon and around 5pm (they also have small training treats throughout the day) ... we use NV red meat, venison, chicken and lamb - they love all of them!