is she leaking?
you could try diaper doublers, I have never had to use them but a friend of mine said they worked wonders...she was having to get up at night for no other reason than to change a diaper and as soon as she used the doubler he slept all night!
As far as food goes, is she happy with less? if she isn't fussy on what you are feeding her now, I wouldn't change it.
HTH, Angie