Put a "Cheerio" (cereal) on her bow tip to see if she can play while keeping it on the tip. With a rubber band attach a large but soft feather to the tip so that the feather tickles her face while bowing. While playing music she has memorized, have her march around the room or put her on your shoulder and you march around the room. While laying on a table on her back have her play. Have her play her music backwards.
Finding simple tunes for her could also help..
Short little fun tunes from cartoons she watches for example.. Those are usually simple enough that anyone can give a go at them regardless of being a beginner and that can be really strong motivation and can even be used as reward for practicing the boring stuff.
Music is all about enjoying it.. so unless you find a way to make her enjoy it and feel adequately rewarded for the effort she's putting in, it will be really hard to attempt to 'force' her to learn and practice..
Hey - O.P. - don't take us too seriously - we can be a "bit off-the-wall" at times - but great suggestions above....
And I have to agree with @Ferenc Simon - if the interest really has "gone" - I doubt anyone or anything, would re-ignite that flame in a youngster..... Just my feeling about it....
I seriously recommend not copying my mistakes. D'oh -
Please make your own, different mistakes, and help us all learn :-)
@BillyG Very true. Kids have short attention spans (heck, I still do, lol)... so thrilled learning something one moment, then on to the next exciting thing, until they get that one thing that they really love and it sticks. For myself as a kid (and as an adult) it was music and art class. Our music class in school wasn't anything more than singing a few tunes a week, but I loved it, haha.
World's Okayest Fiddler
Stick a soda straw in one F hole and bend it to fit into the other F hole, then do it again with another straw creating a 2" lane for the bow to go through. The straws are guards keeping the princess, the bow is there to rescue her. If the bow hits the straw it will wake up the guard. Save the princess.
The only box into which I fit has 6 open sides.