My deprive Citizenship.

My name is Christine Dolores Omega Laird currently processing my application for U.S derivative citizenship for adults at the embassy of the united states in manila, Philippines. i live in Ormoc city leyte philippines. meanwhile my application at the embassy went well but they're giving risky option in able for them to approve my claim since my U.S citizen father already passed away so they recommend me to take DNA test which is very expensive and i cant afford the amount for the test plus its voluntary the embassy will not shoulder for the DNA. the result is the only way for them to approve my application. the reason why i really want this citizenship because i wanted to work in the states which i know is the only way i can support my family here in the Philippines.