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IWP runs on the ports setup by IIS (or Apache if on a Mac) because FileMaker itself is not a web server. The default ports are 80 for unsecured and 443 for secured. I don't think you can change the ports FileMaker uses for IWP inside of FileMaker. You can only control things in IIS. I am speaking without experience in this area because I haven't used FileMaker Pro for IWP in a really long time. But I do use it regularly with FileMaker Server without a hitch and the FileMaker Server install pretty much sets up everything for you automatically.
IWP is not FileMaker Pro and has a lot of limitations at this time (we hope this will change in the near future with 13, but it is not out yet). Light duty web access remotely is OK, but you'll probably be unhappy trying to get her to use IWP primarily. I know you are thinking like most people first do that a web page is a great solution to not buying another copy of FileMaker Pro, but it really isn't worth it in my opinion, at least in version 12 and before.
FileMaker Go is a whole different situation. It is the FileMaker app and not a web page. FileMaker Go will work seamlessly just like it does on FileMaker Pro on your computer.
My recommendation is that you get her FileMaker Pro on her computer and use FileMaker Go on her iPad/iPhone and things will work much more easily.
IWP can be made to work, but expect to spend more time working out the differences between the FileMaker app and IWP.