If the pictures are not, forced therapy is probably the best option.

This is true, but it really depends how “therapy” is defined. And forced therapy could mean anything from things like the old conversion therapy approach for gay people.

You might argue that these days we wouldn’t do anything so barbaric, but considering that the nature of a pedophile’s is very unsavory, and the fact that it will never be acceptable, unlike homosexuality, people would be far more willing to abuse or exploit said “therapy”

Well, clearly it wouldn’t work. You should instead act like you hate gummy worms and give them to her to get rid of them.