Joe,
I suggest that you check the comb height, the pitch and the length of the stock on the 500. Any or all may need some attention.
With your daughter's cheek snugly on the comb, she should see very little of the rib's surface. If this is not the case, raise the comb with some moleskin.
Depending on the development of your daughter, the pitch on the stock may need changing. (Pitch is the angle formed by the recoil pad and the rib, close to 90 degrees.)
The pitch is correct when, with the gun held in front of her with the barrel raised to a normal shooting height and the gun is brought back to her shoulder, the whole recoil pad, top to bottom, should make simultaneous contact.
If the bottom "toe" of the pad makes contact very much before the top of the pad, the pitch should be corrected by either putting washers on the top pad attachment screw between the stock and the pad or, by cutting the stock. Obviously, as your daughter develops further, the correct pitch will also change.
The stock's length is (currently) correct for your daughter when, with the gun mounted with the top of the recoil pad about 3/4" above her collarbone and her cheek is on the comb, there is approximately a one-inch separation between the tip of her nose and her trigger-hand thumb.
Also keep an eye on the wright distribution that she uses. If the gun is too heavy or the stock is too long for them, younger shooters tend to shoot with too much weight on their back feet. This invites excessive felt recoil and can dampen their enthusiasm for shooting. As you know, it is best if more weight is put on the front foot to help absorb recoil.
When the stock is too long for them, they also tend to shoot with their shoulders too closely aligned with the direction they are shooting. This is not good form because it hampers swings in the direction opposite of the side of their gun mount.
Along those lines, it might also be a good time to teach her the best way to swing a shotgun left and right. Ideally, the angle formed by the gun and a line across her shoulders, should not change as she swings horizontally.
All swings are best made by using upper body rotation at the waist and hips like the turret on a tank. Arm-swinging a gun by pivoting it left on the shoulder is not a good idea because it tends to misalign the eye with the rib and, as you know, the eye serves the same purpose as the back sight on a rifle. Move either and the bullet or pattern will move in the same direction.
Rollin