5 That naught but death her dolour might depart.
dolour > pain; mental suffering might > could depart > sever, break off; (catachr.) remove
6 So forth she rode, without repose or rest, 7 Searching all lands and each remotest part, 8 Following the guidance of her blinded guest,
her blinded guest > [Cupid, who shoots his arrows without caring whom they hit. He is often depicted wearing a blindfold. "Guest" here might = "foe" (from the Latin hostis) or perhaps the modern sense applies, in that he is a guest (albeit uninvited) in her heart]
9 Till to the sea coast at length she her addressed.
her addressed > betook herself
304.7
There she +alighted+ from her light-foot beast,
2 And sitting downe vpon the rocky shore,
Bad her old Squire vnlace her lofty creast;
4 Tho hauing vewd a while the surges hore,
That gainst the craggy clifts did loudly rore,
6 And in their raging surquedry disdaynd,
That the fast earth affronted them so sore,
8 And their +deuouring+ couetize restraynd,
Thereat she sighed deepe, and after thus complaynd.
1 alighted > a lighted 1596 8 deuouring > deuoring 1596
1 There she alighted from her lightfoot beast