If you are letting her free range for half a day what you are feeding her isn't that important, especially in regard to laying. With her free ranging you have lost the ability to micromanage her diet.
Do you have the nutrient analysis on that feed? Something that shows the percent of protein, fiber, fats, calcium, and other nutrients. If it really is a scratch it is probably fairly low in protein and high in other things. It is not suitable to be all or most of what she eats. I'd prefer a different feed with a higher protein content like Starter, Grower, All-Flock, or Flock-Raiser with oyster shell offered on the side, even if they free range all day long. What you are doing will not harm her but it means she will not reach her genetic potential as far as production goes.
I assume you mean when will she start laying. I don't know enough about her to answer that. How has she been managed? If she has been kept where they manipulated the lights to keep her laying she may go into a molt and not lay for months. If she was kept without lights and considering the time of the year she could start laying really soon or still could wait for the longer warmer days of later spring.
