M.P.
M.,
Don't worry she'll wake up when she's hungry!! We all do. She needs the sleep which is why she is sleeping a lot; after all she is doing a great deal of growing and learning which requires recovery. My suggestion though is try to not let her sleep super long amounts of time so she gets the rhythm of when to sleep more and when not to (night v. day), but do what you think is right because you are her mother and you know what's best for her.
M. P