A lisp is not a choice. It's a challenge some people face and can be sensitive about. She's been working hard to overcome her lisp.
Pro Tip 2/3
Not an Accent
A lisp differs from an accent. Accents are about pronunciation patterns, while a lisp is a specific speech issue. His lisp stood out, not because of an accent but because of the way he pronounced 's.'
Pro Tip 3/3
Common Misconception
Lisps are often wrongly thought to affect only 's' sounds, but 'z' sounds are also typically involved. People noticed his lisp more when he said 'zebras' than when he said 'sun.'