"As long as" in a sentence with two negatives

"She won't forgive you as long as you don't apologize to her", is apparently not wrong. The same sentence can be rewritten in a lot of ways, like:

She won't forgive you until you apologize to her. She won't forgive you unless you apologize to her. She won't forgive you until and unless you apologize to her. She will forgive you if you apologize to her.

Using two negative clauses in a complex sentence is acceptable.

The sentence is grammatical, but it's pragmatically odd, because one major use of as long as is to introduce a sufficient condition for a desired outcome. (Merriam-Webster gives that use as sense #1, with the definition "provided that". [link]) So the sentence makes it sound like the speaker thinks the interlocutor might be trying to avoid being forgiven, and is either offering advice on how to do that or offering reassurance that the interlocutor's strategy is sufficient to achieve that . . . which is bizarre, because it's highly unusual to think that that might be someone's goal. It's so strange, in fact, that if the suggestion were made more explicit, we would interpret it as intentionally ironic. (Something like "If you don't want her to forgive you, don't worry, all you've got to do is keep on not apologizing" would really mean "You need to apologize.") But as long as isn't quite explicit enough to trigger this ironic interpretation.