Although Frances, by the description by others, was beautiful, intelligent, gracious, and a fascinating conversationalist, she never married, and as far as is known, never received an offer.
Although the following quotes from her letters were not written on Valentine's Day, they seem appropriate for the subject at hand.
"Surely we are tried with just that very form of evil most searching to us, and loneliness of the heart is mine, because it is the only privation I deeply feel—His will be done!"
"Moralists and metaphysicians spend volumes in trying to account for the common observation, that disappointment, or, indeed, love in any form, makes a woman's destiny, while it is only an incident in that of a man; there may be exceptions to the latter observation, I know of none to the first."
"Is there not a lost, stray sort of feeling in belonging to nobody?"
And on an acquaintance to was married after some anxiety: "The natural and inevitable ills of life must come on dear ____, but she will have lost the worst of them—chronic heart-ache."