Bernadette has difficulty spelling words correctly while writing and mixes up letters within words and sentences. Which learning disability does she have?

Dyslexia

Explanation:

Dyslexia is a type of learning disability in which the person finds it difficult to read. This disables a person in reading, writing, spelling, and mathematics also.

The problem with people suffering from dyslexia is that they have a problem in decoding the words. Meaning that they are unable to match the words with sounds

In the given case, the problem that Bernadette is having in spelling the words and writing is due to dyslexia. As she is unable to decode the words and mixes up the letters.

So, the correct answer is dyslexia.