The answer to both of your questions are "no". It makes no difference whatsoever whether the money stays in Colombia or transferred to the U.S.
Once the pension plan releases the money to your wife, it's taxable income to your wife.
U.S. citizens and lawful permanent residents are taxed on their worldwide income, regardless of where they live or work, including foreign pension income, even if it was earned before becoming a U.S. resident.
