Was standing (ιστηκε). Past perfect of ιστημ as imperfect as in John 19:25.

At the tomb (προς τω μνημειω). Προς (in front of) with locative while παρα (by the side of) with locative in John 19:25. Pathetic and common picture of a woman weeping by the tomb. See John 11:31.

As she wept (ως εκλαιεν). Imperfect, "as she was weeping."

She stooped and looked (παρεκυψεν). Aorist active indicative of παρακυπτω for which see verse John 20:5. Mary "peeped into" the tomb, but did not enter.