St Bernard says it's all from GOD.
That is not the issue, but the attribution to her of such great powers, incldg. being the dispenser of all grace, etc., etc. Jesus Himself was given power in Heaven and earth, but no where do we see it even intimated that departed saints are to be heavenly objects of prayer (unless you suppose Abraham was in Heaven in Lk. 16:19ff, but even then the “prayer” was not as thoughts from one’s heart), or are given power that even God is subject to. That is word of faith theology, not Biblical doctrine.
I would not advise you to defend St Bernard here.