>>87779506I'm not trained in practical phonetics, so no help there.
I'd honestly just go for the simplest explanation and say it's a cultivated, if weird, way of speaking, perhaps a part of her kayfabe. From me fucking around in tRPGs, It's surprisingly not very difficult (in principle, just requires volumes of practice) to start speaking like this. Everyone other than trained phoneticians and dialect coaches won't notice you're doing a 1 to 1 replacement. All it requires is you need to have a phonemic model of the language in your head. Let's say I decide to start pronouncing every /t/ sound in English as a /ts/ sound. Depending on my phonemic model, it's gonna cover any subset of:
1. The aspirated t at the onset position (tea),
2. The American intervocalic flapped t (city),
3. The non-aspirated t in a complex onset (station),
4. The assimilated /ch/ sound in "tr" (train), etc., etc.
Once you have a consistent model, phonations are produced automatically and may be very varied.
