] She is indeed a good friend to be able to have wishes of either Mr. Darcy or Col. Fitzwilliam for Lizzy.

Charlotte is not entirely without selfish concerns in this, however.

At the end of Chapter 32, the narrator says:

In her kind schemes for Elizabeth she sometimes planned her marrying Colonel Fitzwilliam. He was beyond comparison the pleasantest man; he certainly admired her, and his situation in life was most eligible; but, to counterbalance these advantages, Mr. Darcy had considerable patronage in the church, and his cousin could have none at all.

Mr Darcy's patronage in the church is, I think, a reference to how he might be able to help the Collinses. That seems to me to be a bit selfish in her plans for Elizabeth's future husband.