Maybe they could hatch into smaller tentacles that stimulate her, I don't know I bet somebody else has more creative ideas than me. Anyways keep up the good work I'm excited for the next update.
you can make it so that she gives birth to eggs, they hatch over time (or instantly) and from them appear mini versions of Mother (possibly with tentacles behind their back (Tokyo ghoul)) or she gives birth to goo (what she does next, there are many variations from the goo simply becoming a new type of manipulator to the goo replacing Mother)