You can tell she tries to work on it.
She sounds like a singer who can’t really hear themselves onstage - and oversings as a result.
I’ve always wondered how much tech support they get at these events. She really needs a good, loud, stage monitor or IEM (in ear monitor) so she can hear herself.
Also - some eq can help a lot. Keep the mic close for proximity effect and boost the lower frequencies in her voice and bring down the 5-8K range, where her voice gets peaky and shrill.
Yes, a vocal coach would solve her problem, and it’s necessary. I’ve heard so many people from ‘08 to now who are majorly turned off by her and though they think she’s “extreme” and “way out there”, it’s really (I believe) only about her vocal delivery. Thatcher realized this about the female voice, so when she was in a heated situation, she purposely lowered her voice and cadence.
It’s a shame the masses are so shallow, but I’m telling you - they are.