I wouldn't even touch dried meal worms - maybe pick them up with a spoon but, ick, I would not want them touching me. It wouldn't end well
Good for your hen that she is feisty, that is probably why the cat hasn't eaten her yet. On the other hand, she may be very aggressive toward the new girls.
You may want to put a divider fence between them in coop and run, so she gets used to seeing them without attacking them. Chickens are flock animals and really do much better with companions - even tho there is that "pecking order," thing they must endure first.