Doll blankets are a great start.
You can also show her how to do a small purse (send a series of photos with simple instructions on how to make the "pocket"). Pillows are good too. PJ pants are easy but you'd need to send her a pattern for her size.
I got my 5yo DGD a machine for Christmas this year since she likes to sew when we have 'sleepovers'. Can't wait until she sees it!