I really need info on ophelia's monologue from hamlet!!!?

basically i have a last minute audition tomorrow and have to learn a clical monologue from a list i was given...i have chosen ophelia's monologue act 2 scene 1 starting with "my lord as i was sewing" (minus polonius' dialogue in between) as i havent enough time to read the whole play tonight i would really appreciate it if someone could tell me what happened before and after this scene and what the monologue is actually about!!! PLEASE HELP!!!! thanks x