I was reading this article and in the first sentence it references a Yalkut Shimoni that states that "Jael, Hagar, Asenath, Zipporah, Shiphrah, Puah, the daughter of Pharaoh, Rahab and Ruth were among the devout women converts". This medrash makes absolutely no sense to me because how would Hagar be considered a convert since Yaakov wasn't even born yet and seemingly even before Sinai someone who "joined" the bnei yisroel would be a convert on some level but before yaakov there was no Jewish tribe and the Gemara in Sotah 11b tells us that Shifra and Puah, were Yocheved and either Miriam or Elisheva. This could be one of those medrashim but I was trying to seek some help if anyone can help me get some more info on this.
The Yalkut is here.
Hagar might be considered "convert", either before Yaakov was born or afterwards - especially if you take the Midrash that says that Ktura is Hagar as a simple fact.
About Shifra anf Puah, sometimes Midrashim have conflicts, so it's not much of a big deal. I agree, assuming that they were converts raises questions, since they have Hebrew names, and the verse says clearly that they were "Hebrew"
שמות א פס טו
וַיֹּ֙אמֶר֙ מֶ֣לֶךְ מִצְרַ֔יִם לַֽמְיַלְּדֹ֖ת הָֽעִבְרִיֹּ֑ת אֲשֶׁ֨ר שֵׁ֤ם הָֽאַחַת֙ שִׁפְרָ֔ה וְשֵׁ֥ם הַשֵּׁנִ֖ית פּוּעָֽה׃
The king of Egypt spoke to the Hebrew midwives, one of whom was named Shiphrah and the other Puah;
My guess, that this a Midrashic answer to hidden question - "Why Pharaoh didn't punished the midwives for their failure?". Answer: because they were actually Egyptian citizens, secretly converted.