I think we need to review the evidence on this one.
See https://www.geni.com/discussions/163420, where Private User writes:
Rabbi Joseph Levinstein, A.B.D. Serock a respected genealogist writes in a letter brought here - http://hebrewbooks.org/pdfpager.aspx?req=46897&st=&... that Elka was married to someone called Avraham of Kremnitz who was a son of Rabbi Chaim Wahl, [Maharal s.in law] son in law of MaHaRaL of Prague - המהר״ל מפראג.
We need to look more closely at
http://hebrewbooks.org/pdfpager.aspx?req=46897&st=&...
Lewinstein may have been respected in his day, but not everyone trusts his work. Lewenstein's son, relying on his father's work, is apparently the source for the false story that the Horowitz family descends from Spain. See https://avotaynuonline.com/2016/03/does-the-horowitz-family-from-bo...
Maybe Private User can take a closer look at this.