How do I respond to this comment ?

[Marisol]

Okay, so yesterday I posted this adorable picture of my 9 month old neice on Instagram. & today this random girl that isnt even following me comments on it & says "I hope she f*cking burns in hell! " Wtf? Why would someone say that about an innocent little baby ? I went to her profile & apperantly im not the first person she has done this too. She obviously has no life & gets some sort of fulfilment out of commenting evil & idiotic things on pictures of peoples kids. Ugh, It just disgustes me how some people can be so coldhearted . I thought of so many things i could tell that heartless b*tch, but i dont want to stoop down to her level. I want to respond to her , but alot of the things i would have said would've been very immature. So, how would you respond to this ?