It's not the mispronunciations. It's the hitches, hesitations, and doubling. "the-uh" is the biggest thing that trips my trigger of disappointment. There are others. It's almost as bad as listening to someone gasping in breath while playing the flute.
No, I'm not going to walk down there and stuff a gag in her mouth. She does not appear to be trying to embelish - she just needs a bit more practice, or perhaps some training.
For me the SSB is like bugle calls - either it's right or it's not. YMMV.
stay safe.