מלכים ב ד:ח פירוש: From David to Destruction, רש״י וMetzudat David

There [lived] a prominent woman. [I.e.,] an important [woman]. And I saw in Pirkei of Rabbi Eliezer,¹⁰Chapter 23. that she was the sister of Avishag the Shunamis.¹¹See I Melochim 1:1-4.¹²She is also identified as the mother of Iddo the prophet.—Radak See I Melochim 13:1 and Rashi there.

He wanted to say, come on the day that Elisha passed through Sunam