That patch is a cure, but I would suggest to make this only a temporary cure. As stated, determine what eye is dominant. Take it from someone that shoots alot, if she is left eye dominant, she will enjoy shooting sports more by getting her shooting with correct form.
I am right handed and left eye dominant. I am in the process of switching to shoot left handed at the age of 44, which is not working out to well. Shooting sporting clays, I use a DOT over the left eye on my glasses. When it comes time for me to qualify with a pistol at the range for law enforment, I have to really concentrate and take my time. After 50 shots or so, my eyes get fatigued and I start having dominance issues dropping my scores.
By starting her out correctly at the early age, you make it more comfortable and easier to master. Just my 2 pennies sir!
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