The ECFs are unanimous about the sinlessness of the Blessed Virgin Mary. The element of the Immaculate Conception that causes problem is the corollary doctrine of Original Sin, ironically, since that’s the doctrine that causes trouble between the Eastern and Western churches that Protestants are pretty much all in on.
No they're not.
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Origen, although he ascribed to Mary high spiritual prerogatives, thought that, at the time of Christ's passion, the sword of disbelief pierced Mary's soul; that she was struck by the poniard of doubt; and that for her sins also Christ died (Origen, "In Luc. hom. xvii").
In the same manner St. Basil writes in the fourth century: he sees in the sword, of which Simeon speaks, the doubt which pierced Mary's soul (Epistle 260).
St. Chrysostom accuses her of ambition, and of putting herself forward unduly when she sought to speak to Jesus at Capharnaum (Matthew 12:46; Chrysostom, Homily 44 on Matthew).
https://www.newadvent.org/cathen/07674d.htm