Sforno on Genesis 16:7/ספורנו על בראשית ט״ז:ז׳

1וימצאה מלאך ה, the angel found her in a state of readiness to receive a Divine vision. As a result, he appeared o her. [after all it is not likely that an angel roamed the earth looking for Hagar. Ed.]

2 על עין המים, she was engaged in prayer. Compare Pessachim 11 where the words of the angel in verse 11 כי שמע ה' אל עניך "for the Lord has heard your affliction" are understood as referring to Hagar's prayer prior to her receiving this vision.

3 על העין, at a junction of the roads. Whenever there is a juncture of two roads this is described as עינים. The place where these two roads commence is called פתח עינים. In Rabbinic parlance this is known as פרשת דרכים, "a parting of the ways." (Ketuvot 17)

4 בדרך שור, this is a place known as חגר, as interpreted by Onkelos. This is a town on the order of the land of Israel, or just beyond the border as mentioned in Gittin 2. The Torah informs us by mentioning this detail that it had been Hagar's intention to emigrate from the land of Israel (Canaan).