start with something simple, a pillowcase, tote, etc. My first project was a potholder.
my sister drew lines, circles on paper. i had to be able to follow them sewing with an unthreaded machine before i could start sewing for real.
Let her pick out some fabric she really likes then chose what to make. she may even want to start with a quilt.
my kids grew up around me sewing yet had no interest until the quilt bug bit them. now they all sew and quilt, I'm constantly amazed at what they do.