it depends on how you sent it,goods and services,Paypaltakes a cut. if you sent US DOLLARS and she lives in Mexico and have a Paypal account based in MExico,her local currency is in pesos,if she does not specify she will accept US dollars and keepthem as US $,Paypal will convert to pesos at 3% fee. if you use a credit or debit card,there are fees,look at Paypal fee schedule
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