Sorry, no, I don't know how you can fix a 9 year old.
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9 years old is way too early for a tubal ligation
Why not buy another plug? You can get USB cables at the dollar store. Make sure to check continuity on the damaged connector, and the new cable & connector, so you can match up the pins.
Absolutely not worth trying to fix a plug like that (instead of replacing the plug with a new plug) IMO. Where would you even start? You'd essentially be trying to make a new plug from scrap and at best creating something inaccurate that'd be unreliable and likely wear or outright damage anything it's plugged into.
I mean, yeah, anything is fixable... in this case you'd probably burn more time fixing it than it's worth. Probably best to make her pay to replace it.