Your only hope is another island event. As you've found, most of the events that give another villager will just clone an existing villager or bring you another male.
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There is however, the 'barrel o' babies' event that might happen - you get a number of kids (all aged 10 if I recall correctly) show up in a barrel, although you'd have to wait a while for any girls to grow up. Even then I suppose it is possible that you won't get any girls. I hope not!

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To err is human; to arr is pirate.