What's left of a relationship already lost and left in ruins? It
is so obvious that she had went back to the ruins, while the man
she loved so deeply, had already travelled and move across the
plains to greener pasture. 
Basically, I understand your kind intention in trying to make her
give up, but in reality nothing but herself can cease that waiting,
pending and longing. The only thing you can do is to constantly
psycho her negatively and gradually - avoid using false hope or
seemingly-false hope because what she needs now is someone to share
the same thinking as her. The minute if you implied something that
fuel this hope, she will believe like a blind faith.
Love Law truth number two: No one can make us stay
in a bad relationship apart from ourselves. (Only she has the
ability and power to leave her past)
Keep talking to your friend? Nah, you have to gradually shock her
with reality truth opposite message from her befuddled mind first.
You may have to avoid seeing her too often as well. Plan this well
- get another mutual good friend and tell her to hang around and be
there for her when it is neccessary. Psychologically, your presence
signify one things:
I) You subconsciously represent your brother.
Remember the day when we broke up and we felt so hurt, we would
tour around the places we used to go when we are a couple?
Sometimes, emotions overwhelmed us and we cry. You represent a
walking scenario.
This is also the reason why she will automatically reject other
guys you attempt to introduce. The heart automatically shut down
and mind switch off - to these guys for since you represent your
brother. 'How could she know other guys when she is 'with' him'
hidden subconscious thoughts will spring out and the reaction would
be rejection outrageously. I suggest attempt Stealth Tactics if you
want these guys to succeed. 
Level 1: Avoid mutual introduction first - her
psychological automatic thoughts will trigger her defensive
mechanism to block off. First tell your other guy friend saying
that you have this good female friend you want to intro to him,
allow him to see her first and seek for his impression. If it is
good, we moved on to level two.
Level 2: Somehow in level two, the three of you
would have to know each other. I suggest avoid putting
three-people-go-out situation, it can be too obvious. A good plan
would be a group outing. Although psychological focus is low, but
our objective isn't this, yet.
Level 3: Once as friends, move on, gradually in
Stealth mode - invisible to woman's sensitive mental radar and
understand her as a friend. Don't have to do aggressive selling,
take things one at the time. As for you, at this level, you would
have to gradually reduce your presence as well. This happens
simultaneously. There will be an unconscious shift of dependancy
from her if the guy witty, adaptable and good enough to follow this
plan. Remember I told you about another good female friends to be
around her? She will appear at this level. (Must pump message that
could implied strongly that your brother had already moved on as
well) 
Level 4: Its beyond your control - like Spirit
entering into Mars. Its all about him now.
P.S: Actually, I foresee that the first guy should fail unless he
is trained and experience in the art of seduction, love and romance
or simply lucky. But the sad thing is that, the second one should
be actual one that can succeed. The first's appearance is to do the
dirty job. (Of course you are not going to tell him that), but
truely, with very good planning and actions from him, he may
succeed. 
Cheers