If she did kill Gabriel, I don't think she thinks it was wrong... Maybe she thinks she gave birth to Gabriel, and he's HER object, and she can dispose of her object when and how she feels like it.
She assaults 2 inmates (caught on video no less), and then says she didn't do it.
Is it possible then, she harmed Gabriel (admits on SMS, and tells LM to get back at him), and then say she didn't do it.
Seems like a pattern of hers... I think she has mental issues, but not enough to NOT know what she's doing, her mental issue is more "denial and extreme selfishness/self righteousness"... so it's not like she couldn't control hurting someone, but more like she thinks it's OK for her to do anything as long as she just pretends it never happened, including murder! MOO.