2B is probably made using titanium or magnesium-based alloys. Adamantine has a hardness of 20 and 40 hit points per inch of thickness. So to find out how many hit points 2B has, we have to figure out literally how thicc she is. Her B/W/H is 84/56/88 in centimeters. Do some conversion and we can assume her torso is about 9.5 inches thick. So she should have 380 hit points.
She is Medium in size, and she's not immobile, so her AC should be 10 + her Dexterity. Since she sometimes demonstrates an uncanny dodge and can have an Unarmored Defense installed via chips, I assume her Dexterity is actually pretty average.
So what we end up with is AC 10, hardness 20, 380hp. Note that breaking down an iron door requires a DC 28 Strength check. I'd rule that due to the space-age materials inside 2B, it would be a DC 33 Strength check to break her, and you'd have to successfully grapple her just to make the check.