A quick internet surf shows that there are many many people out there that certainly believe this woman really existed and that they are her descendants. Once a myth takes hold, if this is a myth, it is almost impossible to extinguish.
In general, I have found that when it comes to Indian Princesses, the Genealogical Proof Standards are thrown out the window. Lack of documentation of any sort is no barrier. No primary or even secondary sources are required and no amount of documentation to the contrary can sway the made up mind.
This may be great family history but it is not genealogy at its best. I have not researched this lady, so I cannot speak to this particular case, but as the old adage goes, Genealogy without documentation is myth.
my opinion only, of course.