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Hold on right there. You have posited a non sequitur. No one will ever say that Mary had has or ever will have a divine nature. Her relationship with God was always, by His grace, the nature that we struggle to obtain in this earthly life.

2Co 5:17 Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new.

Eph 4:22 That ye put off concerning the former conversation the old man, which is corrupt according to the deceitful lusts;
Eph 4:23 And be renewed in the spirit of your mind;
Eph 4:24 And that ye put on the new man, which after God is created in righteousness and true holiness.

Col_3:10 And have put on the new man, which is renewed in knowledge after the image of him that created him:

We as born again Christians do not strive for a new nature...We already have it...