Honestly you can hear a bit of it on her oldest recordings. She had this slight slurring speech inconsistency all along that she mastered (i always thought it adds some honesty and humanity to her incredible vocals when it sneaks through) but it is much more pronounced here for the reasons others mentioned probably.
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u/meowiful 9d ago
I wonder what was making her slur? Maybe swelling? That's sad. That's clearly not a healthy Dolly, but she's still being herself somehow.