HI there,
at this young age things are still going to be a little unstable, but she should be taking a total of 4 naps: 3 1.5-2 hour naps and 1 45 minute catnap, so anywhere from 5-7 hours of day sleep. What is her current routine? You mention that she will sleep up to 3 hours sometiems during the day, however, doesn't that mean she is going into one of her feeding times?
Please list her routine right now and we will go from there.
Thanks!