Help!!!!

My 3rd baby is a beautiful girl, she sleeps great during the night, a bottle at 630, no problem going to bed, than i wake her at 1030 for her next feed and she goes back no worries, sleeps till 430/5ish. Bottle again and than sleep till 730ish. So thats all great!
But than the day.....she sleeps very little, maybe an hour tops between feeds? Late afternoon is horrible, she just wants to be held! As we have 2 boys it is the hard time with dinner etc.
Any tips???????????