Puppies do love to play, but usually have plenty of quiet times as well. I definitely would not reduce her food, as that probably would not affect her energy but might hamper her growth. A hungry pup might be more restless. You could think about changing her food to one of the natural ones with no cereal, or to a raw diet, as the carbs do tend to cause hyperactivity. You could also give her a raw bone to gnaw on which might give you some peace and enable her to work off some energy. Are you walking her on or off lead? On-lead walks will not enable her to run off her energy, so I would definitely recommend off-lead, but 4 walks a day is quite a lot. If you can take her somewhere where she can run and explore off-lead then you should be able to cut the number of walks down if you want to. I would try to establish a routine, so that she gets to know what to expect. Eg.-10 minutes play, breakfast, walk, rest time, 10 minutes play, lunch, walk, rest time etc. They do learn routines really fast and then she'll start to understand the times when she is expected to amuse herself while you do other things. I work at home most of the time, and after a morning walk Dylan does not bother me at all until around 4 ish when he knows that it's getting close to afternoon walk time and will jump up every time I get up! Don't stress too much, it's early days for you yet, and she will settle down once she understands the day's schedule.