Broken Theme When Installing a Plugin

I installed a plugin, and my theme quit working (I’ve been using this theme since last August). The message reads: Stylesheet is missing. In desperation, I tried installing the theme again, but it won’t allow me to. I get this message: Destination folder already exists. /home6/reatiop6/public_html/samanthasbell/wp-content/themes/getnoticed/. After researching the problem for a long time last night, I finally figured out where to find the theme (I am definitely a non-techie). From what I understand, it somehow got moved to the wrong folder.

I found the unsuccessful new installations and deleted them (I realized after reading a lot of posts that don’t want to lose the customizations I had already done, so I’d rather not reinstall anyway). I also found the directory. The theme is here: /public_html/samanthasbell/wp-content/themes/getnoticed. Is that where it’s supposed to be? In the directory, however, there are some things missing. While I can open the folder and see the files, there’s no “minus sign” next to the GetNoticed theme folder. (There’s not one next to TwentyFifteen either, and that stylesheet is missing as well). Although when I click on the folder, everything looks like it’s there.

Here is where it is:

public_html
cgi-bin
samanthasbell
wp-content
themes
GetNoticed

Also, the is missing from the folder further down marked THEMES. For example:

public_html
cgi-bin
wp-content
themes
hatch
Nexus

I think I should move it, but I don’t know where to move it to or how to move it. Thanks for any help you can give me!