Dee had her ears pierced when she was twelve which was mentioned in Mallory and the Trouble with Twins.
She once closed the door on Mallory's finger when she was three. After visiting the doctor, she and John took the family out for ice cream in Kristy's Worst Idea.
She has lots of energy, loves kids, hardly ever yells, and is patient, funny, and organized, as described in Dawn and the Impossible Three. She's not a fanatic about house cleaning. She was the first person to know that Buddy Barrett was missing. Dee helped organize the search party for Buddy and called the police when Jordan told her and Dawn what he saw.
Dee and John sit down with Mallory to explain that she's been feeling taken advantage of in Mallory on Strike. She and John agree to make a day for Mal to focus on herself. They apologize and try not to do it again.
She is a trustee at the public library which was first mentioned in Dawn and the Impossible Three.
She got a job as a temp to help out after Mr. Pike lost his job in Poor Mallory!. She will continue to work once or twice a week. Dee worked as a temporary secretary but only goes to the office when the agency calls.
She used to not work.
- She is a regular client of the BSC and appears or is mentioned in many books.
- Her full first name is revealed in Baby-sitters' European Vacation.
- Dee has a white linen table cloth that came from her grandmother in Get Well Soon, Mallory!.
- She only goes to the salon on special occasion in Get Well Soon, Mallory!.
- Mallory remembers when she was pregnant with Claire she was more tired and busier in Mary Anne + 2 Many Babies.
- She made a casserole a week later for Stacey and Mrs. McGill after they moved in behind them in Mallory and the Mystery Diary.
- She's good with computers and likes working with them in Poor Mallory!.
- She participated in the mother-child softball game that the BSC hosted in Shannon’s Story.
- In The Baby-sitters Remember, Elizabeth Thomas asked her to call Kristy when she baby-sat David Michael for the first time to make sure everything was okay.
- Dee is the member of the PTA in Mallory and the Ghost Cat.
- Mrs. Pike is in some episodes in this series and is portrayed by Caitlin Howden. Dee is given the first name Deidre, it is unknown why her first name is changed.