Genesis 17:4, “Behold, my covenant is with you, and you shall be the father of a multitude of nations.” ESV
“Nation – gowy: nation, people, Gentiles, country. The noun is used to mean nations other than Israel as well: pagan, Gentile, or heathen nations (Exodus 9:24; 34:10; Ezekiel 5:6-8), for all the earth and all the nations belong to God (cf. Exodus 19:5).” ESV Hebrew-Greek Dictionary
I am a daughter of Abraham because I serve the same God, verse 7.