A
Ad_Orientem
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He cannot be tempted anymore, but during His earthly life He could be tempted only from without (by the suggestions of others), and not from any perverted inclination within, of which there was and is none (unlike us, who have an inclination to sin called concupiscence).But Jesus has a “fully human nature” that cannot sin although He may be tempted?
His Mother, too, was given sanctifying grace from her conception, so that she never had a fallen nature, and thus never experienced concupiscence. She was given this singular privilege in virtue of her dignity as Mother of God. The human nature that Christ took from the womb of the Virgin was fully human, but without the stain of sin.
And no, Christ could never have sinned, nor could His Mother have sinned: not by a limitation on freedom, but by a superabundance of grace making them supremely free to choose the good. In theological terminology, they were confirmed in grace. Not so Adam and Eve before their fall.
Christ (in His humanity) also had, from his conception, the face to face vision of God. No man who sees God immediately with the eye of the soul can commit sin: because in that state it is impossible to desire any good more than the obviously supreme good. The angels and saints in heaven enjoy this state.