It looks like “asteroid” just posted much of what I was about to post, but I will post the quote from our discussion anyway. At the bottom the questioner comments on these quotes and poses her question :
Quotes from Liguori’s The Glories of Mary
“All power is given to thee [Mary] in heaven and on earth, and
nothing is impossible to thee, who canst raise those who are in
despair to the hope of salvation.” (p.154)
“Thou art the Mother of God, and all-powerful to save sinners, and
with God thou needest no other recommendation; for thou art the
Mother of true life.” (p.155)
“At the command of Mary, all obey, even God.” (p.155)
“Yes, Mary is omnipotent.” (p.155)
“God has placed the whole Church, not only under the patronage, but
even under the dominion of Mary.” (p.155)
http://www.ourladyweb.com/forum/index.php?topic=931.0
And here we say, that although Mary, now in heaven, can no longer
command her Son, nevertheless her prayers are always the prayers of a
Mother, and consequently most powerful to obtain whatever she
asks. “Mary,” says Saint Bonaventure, “has this great privilege, that
with her Son she above all the Saints is most powerful to obtain
whatever she wills.”
And why? Precisely for the reason on which we have already touched,
and which we shall later on again examine at greater length, because
they are the prayers of a mother. And therefore, says Saint Peter
Damian, the Blessed Virgin can do whatever she pleases both in heaven
and on earth. She is able to raise even those who are in despair to
confidence; and he addresses her in these words: “All power is given
to thee in heaven and on earth, and nothing is impossible to thee,
who canst raise those who are in despair to the hope of salvation.”"
And then he adds that “when the Mother goes to seek a favor for us
from Jesus Christ” (whom the Saint calls the golden altar of mercy,
at which sinners obtain pardon), "her Son esteems her prayers so
greatly, and is so desirous to satisfy her, that when she prays, it
seems as if she rather commanded than prayed, and was rather a queen
than a handmaid. Jesus is pleased thus to honor His beloved Mother,
who honored Him so much during her life, by immediately granting all
that she asks or desires. This is beautifully confirmed by Saint
Germanus, who addressing our Blessed Lady says: “Thou art the Mother
of God, and all powerful to save sinners, and with God thou needest
no other recommendation; for thou art the Mother of true life.” —
From Glories of Mary, Chapter VI.
http://www.marys-touch.com/Glories/ChVI.htm
“Yes, Mary is omnipotent,” repeats Richard of St. Laurence; “for the
queen by every law enjoys the same privileges as the king. And as,”
he adds, “the power of the son and that of the mother is the same, a
mother is made omnipotent by an omnipotent son” (“Eisdem privilegiis
secundum leges gaudent Rex et Regina. Cum autem eadem sit potestas
Matris et Filii ab omnipotente Filio omnipotens Mater est effecta”—De
Laud B. M. l. 4). “And thus,” says St. Antoninus, “God has placed
the whole Church, not only under the patronage, but even under the
dominion of Mary” (“Sub protectione ejus et dominio”—P. 4, t. 15, c.
20, #2).
Now this link goes on to say that Jesus is omnipotent by nature, but
Mary, by the grace of God.
I was always taught that the three “Os” are reserved for God alone –
omnipotence, omniscience, and omnipresence.
Is this true? In one aspect of the divine nature, omnipotence, is
God willing to share it with a creature? Or is this not, though they
deny it, in essence saying Mary is now on par with God as far as
power goes?
And even though I read “Mary isn’t God (even though they have just
said she’s omnipotent),” then what is the difference?
I believe omnipotence is reserved for God alone, and that it is an
attribute He shares with no creature.
I also believe that Mary is not “all-powerful to save sinners,” and
that this language also makes her equal with God, and although we are
assured that is not what they mean, I can take no other meaning from
it.