Hey, im not an expert but at this age my LO slept 3 naps and a cat nap, naps being somewhere between 1.5-2hours. I know waking up babies is not recomened usually but i think i read in Tracys book that babies shouldnt be sleeping longer than 2hours nap during the day or this may rub on their night sleep.... So instead of extending her A time maybe shortening her S time? Or just wait for someone else to reply too, maybe they have a better advice to give:-)