Here's why:
* Appositive Phrase: An appositive phrase is a group of words that renames or identifies a noun or pronoun. It is set off by commas.
* "Mother" is the noun being renamed.
* "Louise making spaghetti" provides more information about the noun "mother." It tells us who the mother is and what she's doing.
The sentence is missing commas to properly identify the appositive phrase, so it would be correctly written as: "Mother, Louise making spaghetti, is in the kitchen."