I wouldn't push it at this point, just keep reading to her. Our kids' teachers told us (and it seemed to be true among our kids and their friends) that reading readiness is something that just happens at different times with different kids, and the best way to help spark a love of reading for our kids, as well as help them develop their comprehension skills, was to read *to* them - not just before they know how to read but all the way through elementary school.
Neither our ds12 or our dd10 was interested in learning to read at 4, but became very good readers. DS12 just suddenly started reading midway through K and went from not knowing part of the alphabet to suddenly reading chapter books. By the end of first grade he was reading at college level. Our dd10 went through what seemed the traditional steps of learning to read, today reads ahead of grade level (although not far ahead), and she is the kid who loves to read so much she walks around with her nose inside a book 99.9% of the time.
I'd be sure to keep reading to her every day, have lots of books around, let her look at her books in bed at night etc. and I might even work on phonics as games - but I'd stay away from external motivation/reward.
Best wishes,
polarbear
