I'm almost as much of a newb as you, so take this for what it's worth....
My bp is about the same size as yours and takes a rat pup every 5 days or so. It seems to me there'd be no harm in offering yours another meal sooner than that if her last was smaller than usual, or you could wait the usual 7 days and then try her on larger prey. Six of one, half dozen of the other IMO.