Sorry to be so long in replying. . . it can be really difficult to tell with guppies sometimes. In my experience, she'll probably get a bit bigger before she's ready, but so much can depend on everything with guppies. I wish I had more concrete advice to give! Hopefully someone will be along soon who can give you a more definitive answer!
She's a beautiful little lady, though - good luck with the expected brood!
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