Start her out on one of the children's sewing machines and teach her the safety rules of sewing...
I started my dgd out with HAND sewing... she had to make a tote bag... (age 4)
Then I bought her a children's sewing machine and she sewed another tote bag to learn her machine (age 4 yrs 10 mos) and then she made a pair of shorts. These machines sew much slower than even the machines with a low gear.
My neighbor was throwing away a Signature (Montgomery Wards) machine that works perfectly with all the feet. She sews on that one now (she's 11).