Love Kernels makes perfect sense, she is desperately grasping for evidence that her Dad really does love her and won't let her down (again), exactly as she does in her romantic relationship with Josh.

My interpretation was that Naomi didn't think Rebecca was going to jump at all and that it was more 'histrionics' - remember the phone call in the pilot where she berates her for "inconveniencing" people with a failed suicide attempt?