[quote=@DirtyDingo]I have also never heard in any legends or canon material of a Jedi being able to perform such an action as making themselves immovable[/quote]
[url=http://starwars.wikia.com/wiki/Force_barrier]Force Barrier[/url] article says:

The pirate Gudb described Thon's shield as being strong enough to halt the advance of a sandcrawler. [url=http://starwars.wikia.com/wiki/Tales_of_the_Jedi_(audio)]Source.[/url]

Whether or not the sandcrawler caused Thon to be moved is not gone into detail.

A Gamorrean is nothing compared to a Sandcrawler.

I'll update it to include the specific mention of Force Barrier.

[quote=@DirtyDingo]Especially when it seems the only points (that I can tell) of the post are to establish that she can handle herself and that she doesn't like Gamorreans.[/quote]Then you missed the point of the post. The Gamorrean was nothing more than a simpler and stupider version of Mandalorians who was using brute strength to subjugate others. It's called an analogy.