So sorry she passed. 
For the future, the basic "rescue" type things for baby chicks is some type of probiotic/electrolyte for their water, and a vitamin also for their water. You would alternate one a day of each and one day of fresh water.
For the probiotic/electrolytes, you can search for cheaper, but we use Hydro Hen, that was recommended by a couple of our silkie breeders.
For the vitamins, most would suggest NutraDrench, as that's fast-acting and what we use as well.
If a chick seems weak, you can give them some drops of straight NutraDrench right in the side of their beak. Also, raw egg yolk is helpful too. I put in a tiny dish and try get them to eat some of it. If they won't, I mix a few drops of water into it and with an eye dropper try get them to take a drop at a time in the side of their beak.

For the future, the basic "rescue" type things for baby chicks is some type of probiotic/electrolyte for their water, and a vitamin also for their water. You would alternate one a day of each and one day of fresh water.
For the probiotic/electrolytes, you can search for cheaper, but we use Hydro Hen, that was recommended by a couple of our silkie breeders.
For the vitamins, most would suggest NutraDrench, as that's fast-acting and what we use as well.
If a chick seems weak, you can give them some drops of straight NutraDrench right in the side of their beak. Also, raw egg yolk is helpful too. I put in a tiny dish and try get them to eat some of it. If they won't, I mix a few drops of water into it and with an eye dropper try get them to take a drop at a time in the side of their beak.