It could mean either; that is why we don't use it.
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zazzexQ. " All the girls didn't leave early" means which one?Nobody knows what it means. If someone uses a sentence with a "universal" subject (all, both, every, ...) and a negative verb, you will have to guess what it means. As for your own speech and writing, don't use these patterns
A. No girls left early.
B. Some girls left early.