I... have transition lens glasses.
I got mine from Costco.
Mine... DOES switch back to CLEAR, when I am indoors.
It is not "always" tinted indoors.
Per your questions:
Your daughter can simply take OFF her glasses, when or if, she is taking photos or someone is taking a photo of her.
With transition lenses... the tint is lighter than actual Sunglasses. So, if she wore sunglasses, you would not be able to see her eyes... more so.
With my transition lenses... my eyes CAN be seen. The glass is J. tinted. But my prescription Sunglasses... are DARKER.
Sure, transition lenses takes a bit of time to turn back to clear. But that is how it is. People buy it and use it, knowing that. And no... being in Kindergarten does not mean, that they are constantly going indoors and outdoors constantly and always. The MAJORITY of the time, they are IN class. In the classroom.
My son is in Kindergarten. They are in class mostly. Not outdoors.
I have transition lenses. I like it VERY much. It protects my eyes in the sun AND it is my prescription lenses.
If I did NOT have my transition lenses... then... I would have to ALWAYS, also be keeping my prescription Sunglasses on M.... and then, change from my prescription regular glasses to my prescription Sunglasses, ALL the time... when I go from home to outdoors to the car, in and out of the car for driving, out to the store, errands, etc. It is a BIG PAIN in the rear. That is why... I got my Transition Lenses.
Now, I don't have to constantly switch out, between prescription Sunglasses and regular prescription glasses, all the darn time.
And... I HATED having to carry TWO glasses on M., all.the.time.
And... Sunglasses, are DARKER than Transition lenses. Keep that in mind.
Also keep in mind that when a Transition lens becomes tinted because the person is outdoors in FULL sunlight... the lens is also not as dark as Sunglasses would be. AND the person still can see, out of the tinted lenses, very well, but the glare is cut out.
With my prescription Sunglasses... those lenses were MUCH darker.