You realize that unless your grand-daugher is adult size most patterns will need to be modified.
I looked for the one I made up for my 7 year old granddaughter but have not found it yet. Below is how I did hers.
But I simply measured the wrist and the palm. Rib stitch (k2,p2) at wrist for 2 inches and added enough stitch after the wrist to be wide enough for the palm. I knitted the distance for the wrist bone to the knuckles and changing to rib for 1/2 inch near knuckles. Now this is a square piece, so fold over and sew seam leaving a hole for the thumb.
Example: Cast on 20 stitches, work K2, P2 rib for 8 rows. Change to stocking stitch increasing 4 st evenly along 1st row, then work 16 rows. Then work another 4 rows in rib. Cast off. Make two the same, then sew up the side, leaving a space unsewn for your thumb. This could work for size 7 or 8 needle yarn. You will need to measure the child and check as you knit. After you do this first one, you can repeat what worked.
or
Goggle search children fingerless glove pattern and you will find several patterns = most are easy.