The difference is that she's and similar shortened forms are used in colloquial speech, but not in certain cases. In your example, she is being emphasised.
When to use "she's"(short form) and and "she is"(full form)? What is ...
I came across the following sentence in a book I am reading: He, like her, did not die a natural death. Should it be 'she' instead of 'her', since both 'he' and 'she' are performing the action (d...
"He, like her" or "He, like she" - English Language & Usage Stack Exchange
I saw this from globalnews.ca: Molly Johnson on the album she’s always wanted to make When referring to google ngram, I get 3 possible combinations of she's: She 's She's She has So my question is should she has be contracted as she 's in the above example like in the examples found from google ngram to avoid confusion?
It is not needed because the questions could be more concisely put as " Where is she/he?". This redundancy, and the efforts of seventeenth and eighteenth century grammarians to align English with Latin, lead some people to say it is ungrammatical to end with " at ".
Where is she? or Where is she at? - English Language & Usage Stack Exchange
In short, "she/they" is the most common way for a person to indicate that they go by "she/her" or "they/them" pronouns, likely with a preference for the former. It is not incorrect. Note: While "she/they" is commonly used by feminine-leaning non-binary people, a great deal of women (both cis and trans) also go by it.