If you didn't notice we have a new name. It was suggested that I change the name to reflect what this thread is really all about.
How To Find Who She Is
If you have 10 good posts then please feel free to make a request, but only after you've read the first few pages of this thread. That way your request will be taken seriously and I'm sure all the members here will try to help you find what you're looking for, especially if she's hot.
How to Reverse Search Summary
There are several search engines, but the main ones are Google, Tineye and Yandex.
My best advice is to go to YouTube and search 'How to reverse image search using xxxxx' and replace the xxxxx with one of the big image search engines.
To have better results when searching using Yandex look at the top right for the shield icon next to 'registration'. When you click on that you can select 'unsecure' which will search more thoroughly to expose more pics if they're out there somewhere.
Another good thing to know is when you see a list of similar photos at the top of the page click on the first image and check out the photos to see if you can find a website that contains the pics you're looking for.
I recommend you go to the first post in this thread and start reading. There are lots of how to videos and information that will explain clearly how to find photos using reverse image searches.
One more thing, you may not find anything. Sometimes there is only the one pic online or a set may exist on a pay site that doesn't allow the search engines to snoop. They may exist on a hard drive somewhere, but you simply may not every find it. The best you can do is to try reverse image searches and then ask here. If you are making a request please include what you've already done so people know the background a little bit and maybe a pro image searcher will be able to focus a little better on the task when they have all the information.