I don't know that I agree with the concept of these ladies suffering in silence. Tolkien simply has not chosen to report what they might have had to say about their various plights.
Finduilas "sickened" and died while Faramir was still a very young child. Whether she contracted some sort of disease (tuberculosis? cancer? who knows?), or pined away for her seaside home in Dol Amroth, or was a sensitive soul who could not withstand the horror of living so close to Mordor and witnessing the gradual dissolution of her husband's sanity, or some combination of these three situations, we simply do not know. But I think it is quite a leap to assume she suffered in silence. Tolkien is the silent one, giving us peeks and hints, but saying nothing definitive about the poor lady's plight.
Likewise with Celebrian, Tolkien reports that she was captured and "tormented" by orcs, sustaining a poisoned arrow wound in the process. I don't think it takes much imagination to figure out what the Professor meant by "tormented." It took Elrond many days and nights to "heal" her. Aside from her poisoned wound, I believe this means he had to exert tremendous effort to call her wandering, wounded spirit and mind back to some semblance of sanity after her horrible ordeal. She was never the same afterwards and eventually decided to depart for the Undying Lands to seek final solace for her grief and horror at having been so violated. I can't imagine this decision was made in "silence." However, the Professor does not chose to share the details of her pain with us or to relate the discussion with Elrond and her children that ultimately led to her decision to depart. Again, this is Tolkien's silence, not Celebrian's.
I also do not believe that Eowyn "suffered in silence." She may have been more vocal earlier on about her concerns for Theoden and her desire to take a more active role in helping her people. But after years of having her concerns squelched by the machinations of Grima Wormtongue and/or ignored or passed over by her brother who had a more traditional view of her role, she lapsed into silence, eventually becoming grave, cold, and bitter "when all her life seemed shrinking, and the walls of her bower closing in about her, a hutch to trammel some wild thing in?"
Even then, once our heroes appeared in Edoras, Eowyn dared to speak up, asking to be allowed to go to war with the men -- "I am of the House of Eorl and not a serving-woman. I can ride and wield blade, and I do not fear either pain or death" -- and especially to accompany Aragorn on the Paths of the Dead. She even came very close to declaring her love for Aragorn directly at that point, "They go only because they would not be parted from thee -- because they love thee." Quite a daring declaration for a young lady!
Where Eowyn is somewhat silent is in her refusal to give voice to her inward pain, whether this is from past experience with having her feelings and needs ignored by the ailing King and her brother under the press of greater concerns or whether it is something that her strength and pride simply will not let her do. Yet even this she eventually confesses to Aragorn when he asks what she fears: "A cage . . . . To stay behind bars, until use and old age accept them, and all chance of doing great deeds is gone beyond recall or desire."
I would advocate that Eowyn did indeed voice her pain and grief. It was not noticed by her uncle or brother, maliciously reinforced by Grima, and ultimately perceived and understood by Aragorn, who was in no position to help her at the time.
“Therefore I say: Eä! Let these things Be! And I will send forth into the Void the Flame Imperishable, and it shall be at the heart of the World, and the World shall Be.”