Fattening up a target mandarin

[Bunnyspit]

I messed up. Currently I have a male red mandy that I wanted to buy a mate, so I searched everywhere for a female target mandy. Finally I found one. Shes a tiny little thing, less than half the size of my red. I didnt make sure she was eating at the LFS. But they did say she was a new arrival. When I started looking at her in my tank I started to panic. Shes so so skinny. First things first I ran out and got a bunch of baby brine (which has since disappeared between her and Red) and some pods. I can see shes eating and chewing. I've only had her 3 days and I dont expect her to be all fattened up but I'm scared of losing her. Anyone know a good way to fatten up mandys?

 

[Bunnyspit]

These are the few pics I got of her