This is just a bad joke. And not a good-bad joke from the Jungle Cruise, but just bad-bad.
Alberta Falls and her backstory appears to be created by Imagineers who have absolutely no idea how the Jungle Cruise works. And more importantly, no idea how the audience experiences the attraction as they wait in line, load into boats, and then pivot and strain to get 4 or 5 second glimpses at the animals and funny little vignettes along the river.
This new Alberta Falls backstory, even if they try and hit us over the head with it via some new queue pre-show or blatant animatronic dialogue by a riverbank Skipper, will be ignored and/or missed by 99.5% of the audience. It doesn't matter what race or ethnicity Alberta Falls is, or isn't, she won't enter the audiences mind in the least.
And then there's the poor CM's who will be forced to tell a couple of new jokes that aren't that funny but mandatorily mention Alberta Falls. No joke created by a committee from HR will ever be funny. Ever.
This is yet another example of WDI losing complete sight of how the park works, and how its audience experiences it.