My Mind Map Plan, But Translated To Don Language.

(My apologies for hideous typos, wireless keyboard running low on batteries)
 Key for highlightednessnosity

Act One

Act Two

Act Three

Act Four

Act Five
 Vague notes
Adding to H's pain
H forced to cast her aside

Already lower class

Maybe pregnant
She thinks ill of him (innuendo, nunnery)
Why is she there?
Princes of Hamlet's age require heirs - shows H's life going well until occurances of play?
Tool for H (Trousers, nunnery, play, grave fighting)
Tragic element in herself (life going well, boyf goes nuts, boyf kills dad, she goes mad, kills self either accidentally or on purpose yet real intentions questionable as of madness)
Used by all (sex, madness, investigation, excuse to duel)
What was Shakey thinking?
Sex before act 1 - Wants to look like average castle or like they had a chance of being together?
Shows no major moments in Ophy's life - Not seeing heightens imagination of events, increasing tragedy?  - Invisibility of women?
Intro
In my opinion, two main questions to ask r.e. Ophelia's role.
Why is she there?
How is she adding to Hamlet's pain?
Q. can be answered by analysing each section she is in in each scene

Para one,
Act one,
Brother leaves, leaving Ophy without main source of protection
Dad forbids her to go near H - Tragic in itself, as they may be in love, or she may be up the duff. 
She's there because it provides H with element of life already going down tube, love is lower class etc.
Heightens pain simply by existing. ( I know what I mean)
Para two, act two
Trousers scene. - Ophy quite traumatised.
She's stopped writing to him.
Trousers scene traumatising maybe because she knows is improper, is shocked to see he who she is avoiding, rejects him again.
She's there as is being used as a tool by H, main reason she is there, really, just a tool used, very topical as women's rights were rubbishy back then.  Women used for babbies and no more!!
Causes H pain because he may be in love with her and she rejects over and over
Para three, act three
Nunneryism - Ophy cast aside, used again but by father (supposed protector) and kingy.
Play - H uses innuendos and the like just after he casts her away, head in lap, seems like he is undecided, confusing her into insanity? (Not literally, though probably cause in long run)
H kills her dad.
There again as a tool; by rejecting then taking Ophy back, H seems more mad, maybe giving into desires. 
ADding to H's pain, seems "cool" about him not being around, if he loves her that would sting.
Para 4, act 4, longest para tbh
Boyf chops up dad's body, hints at hiding in food.
Singing -
-Sex
  -With H
  -H gets up and leaves
-Death
  -Own?
  -Love?
  -H?
  -Polonius?
Drowns -
-Traigc as just had found happiness (be it also madness)
-Playing
  -Eventual innocence and joy.
-Wreaths of flowers
  -Funeral tradition!!
  -Knew was dying, therefore?
  -Childlike, daisy chains etc.
-Allows self to die
  -Slips from willow tree, apt as weeping willow
  -Preggers, then?
  -Singing
  -Knew/ignorant to danger?
Why is she there?  Entire act is great big massive tragic scream for her.
H's pain?  Not much atm, but when he comes back he's gonna be pretty upset his girlfriend's dead, having been driven mad by him pretending to be mad. (yes yes, debateable.)
Para five, act five
Debated if she should be buried in church, as suicide poss.
H ignorant
H discovers death in very insensitive manner, jumps in grave in despair.
Ophy's death possibly used to intitiate duel.  Could mean she is being used as tool AGAIN. Also could mean indirectly causes death of pretty much everyone but Horatio and Osrick. (And some Norwegians, but really, they just turn up at the last bit and are of little to no real consequence).

Conclusion.
Ophy's role is to be used, as women were, as a tool for men to get what they want, and could be classed in herself, in my opinion, a tragic device (literally!!)