Is it normal for a newly diagnosed Parkinsons patient to suddenly act like a 5 year old?

My mom is 72 years old and used to be really demanding when I was growing up. She was diagnosed with Parkinson's last year and now she is so whiny and needy. I took her shopping yesterday and went to grab a few things for myself, she said in her whiny voice "you left me and I was scared" but when I call her on it, she snaps out immediately. Is this still her controlling personality from when I was young? Or is it part of the disease? She usually will pull that needy, whiny voice when she wants something...