In the first film they let her go in order to get back Frank. Naturally they want to feel her flesh, so they chase her down in the end... but she escapes.

In the second one when they first see her they do not touch her. In fact, they even allow her to explore and search for her father. When they meet again there is a wonderful exchange of words between her and the Cenobites, and they still don't attack her... They even stall AGAIN so she can give them information.

And in the end they die protecting her.

And I just found out that in one of the sequels, Hellseeker, they AGAIN make a deal with her (even after telling her last time they met "no more deals"). They let her go in exchange for five other souls. Pinhead may have shown some leniency due to the fact Kirsty helped him discover who he once was... but still that seems like a hell of a lot of special treatment for Kirsty. I mean, were they that nice to anyone else in the other films (which I have not seen).

I love Kirsty... and it seems to me Pinhead and the Cenobites love her too lol