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
Don't replace the USB connector, replace the entire cable. It'll be way easier.
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.