Hi there,
Pringles is so cute and I love her name!
My first thought is quite honestly that calico cats have a reputation for being chatty or vocal, and she may just be developing part of her personality at her age.
The next thought is that she could have an uncommon condition that is causing her to go into heat despite her spay. Ectopic ovarian tissue (reproductive tissue that grows in an abnormal place) can cause this, as well as exposure to estrogen containing creams for humans. The easiest test to confirm this is a swab of vaginal tissue.
Here is a ink to learn more from a website I like:
https://veterinarypartner.vin.com/default.aspx?pid=19239&catId=102899&id=5998538If she is showing other signs of in heat behavior, I'd recommend contacting her veterinarian that spayed her. They will be able to guide you through testing and confirming if there is any additional reproductive tissue. If there is, she will need a second spay-like procedure to have that tissue removed as well. This is uncommon, but pets with this condition tend to recover and do well in the long term.
I hope this is helpful. Thanks for using PetCoach.