These might be new craft ideas, but if she is 6 years old, she's probably old enough for sewing. You could help her learn to embroider things, then help her make the embroidered fabric into lots of different
things:quilt it into quilts, pot holders, pillows, frame for wall hangings, embroider tea towels, bath towels, pillowcases.... Yes she is pretty young, but historically, she would have been doing it for a while.
You could get big bluntish needles (if you were worried about sharp ones), and two peices of felt (or teddy bear material or....) and help her (or let her) cut out teddy bear or dog or bunny shapes and sewing them together and then stuffing them. Its a fun way to teach her the very basics of sewing. (my aunt gave me a sewing box (hat box) with some fabric, felt and really simple animal shape patterns. I think I still have a stuffy or two from it in said sewing box)
If its stuff you can do together, 6 year olds are old enough to "help" with larger sewing projects (halloween costumes, clothes for her, 20 king and queen cloaks for kids to decorate at her 5th birthday party (yeah, my mom had all the patience in the world lol).
Also always big when I was growing up was collage and decoupage. Collages are really just more stuff to hang on the walls, but my dad still uses the wooden boxes from michaels or something that my sister and I painted and glued pictures and sea shells and other little things onto for change and other little things. My mom uses a cardboard box we painted for change.
I learned to knit at her age. Maybe just scarves and coasters (and I suppose you could make pot holders too), but scarves make good presents and are really easy to make and go fast if you use a bulky yarn. Crochet, I don't know (can't do it really even now lol, though since I'm staring at a coaster I made my mom a couple years ago, apparently I can), but I imagine she could do that as well.
Clay of various sorts is fun, and makes all kinds of trinkets for mama and daddy's desks.
making pot holders with those loop weaving kits, fabric markers and puffy paint make a new medium for painted objects (what about you sewing things and her decorating them, or buying blank ones for her to
decorate:aprons, hats, shirts, pot holders, really anything), bake on pens for drawing on mugs, or plates (or those kits where they put your kids drawing on the plate but I'm sure thats more expensive)