I would tell her yardages + 25% cutting waste, then ask if she will be picking up the fabric herself, or going with you. I used to lose out a lot by using stash fabrics to fill in on commissioned pieces. You'll be happier in the long run if the costs (thread, needles, electricity are included) are covered.
Whether you charge labor depends on your closeness to her. Would she reciprocate if you needed help moving, or cleaning out your garage? Do you owe her favor? If not, that needs to be factored in.