Going to check into the knitting loom we used to do the potholders with a loom but we had cotton loops so they did not melt with hot items now they seem to be all nylon. Oh Lynnie I used to have that little pig game wonder where it went! I did buy a new rubberband loom just need to get more bands I live in a small town with no resources so I might have a day trip with her too!

I have seen jewelry kits at Walmart and similar stores. They look like they would be fun for a 10yo. Some are for braiding friendship bracelets, some are for making bead necklaces and bracelets, etc. if nothing is available in your hometown, perhaps check out these kinds of kits on Amazon.

I was going to say yo-yos as well. IMHO they are easier than hexies. And she can add them to jeans, bags, hair bands or just sew them to a hair clip. For a non sewing option get some paint pens and draw designs on stones or pieces of wood you find. You can take them home or just leave them in the woods for fun. Check Pinterest or google search for painted stones.

The painted stones are fun we found some lasty ear and made some of our own to leave behind. I am thinking a tick tack tow game on a log with painted stones. That will keep us busy for a short time! Maybe modge podging bigger rocks to leave behind also

She is a great one for saying I am bored Grandma Ugg gotta have something in reserve to keep her busy!

Card games can be fun with just 2 people, gin rummy, slap jack, crazy 8s or teach her a favorite solitaire game.

Take pictures from previous trips and make photo albums she can take home with her. It can be as simple as gluing pictures on Construnction and adding words and stickers, or as complicated as you want.

That is the age I got my oldest hooked on Nancy Drew books she still loves them and all books my youngest on the other hand never did get a love for reading I tried it just never took.

Gather sticks and make an outline of a hopscotch game and play hopscotch. Take jump ropes and make up games and rhymes while jumping. She can jump you can make up the rhymes.

Do you have bocce balls? You can usually get an enexpensive set at places like Walmart or target.

Take scrap fabric and Construnction paper glue a quilt together or make a wall hanging with them and the natural elements in your campground.

I visited my grandmother when I was about your granddaughter's age and my GM had started a latch-hook project. I finished it and had a blast.

Board games like Scrabble are fun too!

I like the billi suggestion, she can make a fabric quilt and staple it together and leave for the next camper. will there be water near by to fish. I always loved that.

the yo yos come in different shapes also. she may make square ones for the beginning of a quilt she sews everytime she's with you.

Zentangles are hot right now. theres some books on it. I bought my son (25)
and some Micron markers and color brush markers to play with it. It's lots of
fun and you can join in on the fun. look it up on you tube, lotsa fun!

Finger Knitting is fun for kids. When my dd was that age she made scarves for everyone.

Or teach her how to crochet. Crochet was always easier for me than knitting.

Books, bring some you read as a child and some current kids fiction.

Press leaves and flowers

When I was 7 my grandmother taught me to spin and my grandfather (other side of the family) made me a simple loom. I could make placemats on it.

If you are on water teach her to fish.

Pick berries and make jam.

Get a rock hound book and identify the local rocks.

Get a plant book and identify the local plants

Same applies to birds, bugs etc.

Build a bird feeder and see who comes to eat there.

Create a recipe book of your and her favourite recipes. If you have any from your own mother or grandmother include them too.

Take a photo of the two of you each and every day of the time you are together. Take pictures of your activities, with flour on your noses, dirt on your hands, snuggled up together, and in your swim suits, (even if you have not had a photo of yourself in a swimsuit in 50 years). Those will allow her to hold on to the memories for the rest of her life. I was lucky to spend 3 weeks with my grandmother when I was 16. She died 3 months later. I do not have a single photo of the two of us alone together.

I have only one photo of me, my mum and my other Granny taken 6 months before she died, it was my wedding day. We did so much together (many of the things I listed above), but there is no photo record of it.