Looking at the new photo I see that she also now has a lesion on her eye. This could be Wet Form Fowl Pox. It really is hard to advise course of treatment. All information you have received are suggestions by backyard chicken keepers just like you. There is no way to tell you which/what treatment will be most effective. You will need to do some research/reading to determine what you think is best course of action and take it.
Acidified Copper Sulfate does have it's place in treatment plans, but you need to know this is the correct product and use it properly. If you have the original packaging, please read the directions and make sure the product is to be used for what you intend it for.
Canker
http://forum.thepoultrysite.com/discussion/3306/redirect/p1
http://www.thepoultrysite.com/diseaseinfo/154/trichomoniasis-canker-frounce/
https://www.backyardchickens.com/t/1080266/canker Picture#10
https://www.backyardchickens.com/t/773308/canker-treatment POST #4
https://www.backyardchickens.com/t/1064166/canker-tried-few-treatments-not-getting-better POST#2
FOWL POX
http://www.hyline.com/aspx/redbook/redbook.aspx?s=5&p=35
http://www.the-chicken-chick.com/2015/07/fowl-pox-prevention-treatment.html
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