Try putting her down for her morning nap earlier .... If she normally goes down from 9-10 back it up 15 minutes earlier each day till she is going down from 8-9 and see if that makes a difference ..... If not then start shortening the nap by 10 minute increments. I have a new one I just started 3 weeks ago and mom also could not get him to sleep very long in the afternoon so I suggested back it up and shortening it... I now put him down from 8-8:30 (only 30 mins) and then he goes down again in the afternoon at 12:15 for 2.5 hours. Give it a shot