She will breastfeed, she will get there. While, generally, the whole suck, swallow, breathe, reflex comes in between 35 to 37 weeks, some babies take longer then others and that is completely normal. Sometimes it will just click and they go from doing no sucks to sucking every feed in a day or two, and for others it is very very gradual. Sometimes babies who have had blood sugar problems can take a bit longer then others as well. Work on her being home around her due date and anything before that is a good bonus.