Question: When do you think that #ruth became a part of #israel?

I would argue that #yah saw her as Israel the moment she said this:

"And Ruth said, Intreat me not to leave thee, or to return from following after thee: for whither thou goest, I will go; and where thou lodgest, I will lodge: thy people shall be my people, and thy God my God: Where thou diest, will I die, and there will I be buried: the LORD (Yahuwah) do so to me, and more also, if ought but death part thee and me."
(Rth 1:16-17 KJV)

The nation of Israel has always been comprised of direct descendants of #abraham and those who have joined to Abraham's house so to speak.