Wow, that's... shitty of her. Incredibly shitty. I was kinda thinking the baby situation may come out like that one Korean movie that I liked ages ago (which ends in a heartwarming note besides some development)... but seeing as the poor kid is just being used as a revenge tool (an orphan kid at THAT) just because of jealousy is pretty messed up.
Hopefully the whole situation ends on a sweet note, but f*ck that Jennie girl.