So I set up a paypal account for my sister, and I transfer my US money to her paypal account for free.
That will work for $500/month at which point your Sister would need to upgrade to a non-free PayPal account.
If you're only dealing with $500 then there's little reason to go through the extra effort.
You would be better off just adding your Sister's bank account to YOUR PayPal account. If not here regular account then one she could open just for your use. Of course if you ever cross the border to visit you could just open your own account.
It's now fairly difficult but it can be possible to open a US account without doing it in person.

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
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