There are a few points to remember:
* Disapparation is not a curse: It is a complex spell that allows a wizard to disappear from one location and reappear in another.
* Hermione was trying to protect herself and her friends: She was trying to get them to safety after they were attacked by Snatchers.
* The "curse" was actually a powerful spell: Hermione used a powerful spell to protect them from the Snatchers, but it wasn't a curse in the traditional sense.
It is important to note that the specific spell used by Hermione is never mentioned explicitly in the books. However, it is clear that it was a very effective and powerful spell, as it protected them from the Snatchers.