Lona can give birth to Orkin and Goblin babies, these can be sold to Elise.
If you want to reborn as an abomination, you need to sell 2 abomination babies that Lona gave birth to Elise using the "Sell Child" option, NOT barter. For a mixed race between Abomination + Moot, you need to sell 4 instead.
You can abandon human, moot, and deepone babies at the church and still preserve the option to reborn (this is so the baby doesn't drain your resources).