The others had some great ideas. :)
The first few days are going to be hard, especially if she sees significantly better with the eye that you're patching. Plan a fun activity to do together when she first starts wearing the patch. It could be reading a new book, baking cookies, coloring a special picture- something active and fun for your daughter.
It helps some children to be in a routine- like wearing the patch first thing in the morning and knowing it can come off after lunch (or whenever the amount of patching your doctor prescribed is up)
If you go for the whole pirate game, please make sure your daughter is wearing her sticky patch under the felt patch. (it's really easy to peek around felt patches).
If your daughter has a special stuffed animal or doll, the doll can wear a patch too.
Let her decorate some patches. You could also invite friends, neighbors, and extended family to decorate some patches for her, so they're more special.
Companies like ortopad sell cute patches. They also sell rewards posters (you can of course make your own!) that your daughter can stick the patch on if she does a good job wearing it. You can make up your own reward for filling the poster. It doesn't have to be expensive. It could be something like letting her pick what you have for dinner.
http://ortopadusa.com/sp-bin/spirit?PAGE=43
You can make up your own reward for filling the poster. It doesn't have to be expensive. It could be something like letting her pick what you have for dinner.
Some doctors may prescribe a type of plastic, like tegaderm, that goes over the patch and makes it a lot harder to peel off.
Finally, you may have to "lay down the law" like teaching your child not to touch a hot stove. You may have to be the one who is allowed to take off the patch, and not let your daughter do it herself.
Good luck!