Mix the starter with a bit of water to make a thick, wet mash - it may be easier for her to eat and a lot of chickens prefer wetted feed.This may sound weird but the Purina starter/grower seem too large for her. Or else she just isn't interested in it for some reason. She pecks it very rarely compared to the others.
I let her be for a bit today to see if she would eat more crumbles, but I didn't see her eat much