Oh dear, that is strange isn't it! I'm glad she improved that quickly though.
Grower feed is probably fine depending on the protein. For chicks I would stick with a feed that has at least 18% protein (or more) up until at least they come into lay.
I assume you will be getting the meds that come in a package and is powdered/soluble. Directions and dosing should be on the package. If not, then post photos of the product you have and I may be able to help you with dosing.
Either one of those should be fine. Doxy-Tyl is Doxycycline and...
Both eyes look a bit sunken which can indicate respiratory infection. If you are seeing bubbles, you may be dealing with Mycoplasma, but without testing, there's no way to know for sure.
Continue with cleaning the eyes and using the ointment like you are doing. Tylosin or Doxy-Tyl should...
Were you able to source some Endocox (Toltrizuril) as suggested in your other thread last week? I'd treat with that.
https://www.backyardchickens.com/threads/cocci-help-needed.1622187/post-27710451