Actually, she had a visa, so she had a British Government given right to enter and remain in the UK. She also had British Government given rights to call someone and to have the complaint signed in her presence.
The only right left to her after the big keychain a**holes were done was her right to complain from off-shore.
I don't know how much traveling you've done overseas, but I've done a fair amount.Every nation I've been to has immigration laws/regulations that are at least as restrictive as those of the US.Among the things that these laws stipulate is that an immigration officer has the absolute right to deny entry to any foreigner for any reason.
Was what happened to that woman a good thing for the UK's image? Probably not.
Would word of this incident displease the folks at the UK's government tourism board? Probably.
Might an Australian diplomat/government official lodge a formal complaint over this incident? Possibly.
But the fact remains that she had no intrinsic right to enter or remain in the UK.