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.
Some reading regarding "esessences" and "energies" of God and how humans can and connot participate in them might be helpful, if you care to do the work.
Yes???
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...