in this film two girls break out of prison, kill an old couple and go down to mexico, about 1995?

it's a sequel, think it may be something like, bad road 2, the sugarhouse, but i can't find any film with even a vaguely similar title, it's possibly a mexican film, as the main part of the story is set in mexico.

the film gets really wierd when the girls get to grandmas' house, it turns out she is a man and adopts young children so they can be filmed with old men.

the film takes on a proper twisted fairytale feel when the girls find out what's happening in the sugarhouse and they end up having to kill the old woman by throwing her into the oven before slaughtering everyone else in the place..

any ideas? may be mexican, possibly mid nineties, almost certainly a foreign director. certificate 18 i would expect..

thanks