To add to what Fede has found...
From the notes/commentary for Acchariya-abbhuta Sutta (Sutta 123) of the MN, in the Bhikkhu Nanamoli/Bhikkhu Bodhi translation:
"(The mother's death) happened, not through a defect in the birth, but through the expiration of her lifespan; for the place (in the womb) occupied by the Bodhisatta, like the inner chamber of a cetiya, is not to be used by others."
I looked but could not find some other info you may be interested in regarding the Buddha traveling to the Tusita heaven to teach the Dhamma to his mother.
Through many of samsara’s births I hasten seeking, finding not the builder of this house - pain is birth again, again. O builder of this house you’re seen, you shall not build a house again, all your beams have given away, rafters of the ridge decayed, mind to the unconditioned gone, exhaustion of craving has it reached.(Dhp - 153, 154)