Under Philippine law a Filipina who marries an alien or foreigner retains her citizenship unless by her act or omission she is deemed under Philippine law to have renounced her Philippine citizenship. If your daughter has not renounced her Philippine citizenship (example through swearing allegiance to and becoming a citizen of her husband's country) she is not prohibited from acquiring and owning real property in the Philippines.

However, under the Dual Citizenship Law of 2003, natural born citizens of the Philippines who have lost their Philippine citizenship by reason of their naturalization as citizens of another country may reacquire Philippine citizenship by swearing allegiance to the Philippine. Once they reacquired their Philippine citizenship, they can buy and own real property in the Philippines.