Pooches: Miss M is Pleasant

It has always been a running joke that Miss M really doesn't like us, and she is more interested in being a Social Butterfly.
When I first met her at her adoption event, I was shocked to find a dog who was so into me. But soon after I signed those adoption papers, I realized she was actually into every single person she met:

And while she was a popular pooch out on the streets, I started to think she didn't really like us that much.
Each morning, she follows me around with this face, waiting until I tell her to "go to bed" because she would much rather hang out in her crate eating a kong than hang out with me.

Not to mention how embarrassed she is to be seen with her people in public:

Though lately, things have been changing. I have actually been shocked to arrive home and have Miss M race to the back door to greet me...and actually stay and wiggle when she realizes it is me.
She has also started following me around. And being pleasant!
I was actually a bit worried, and I wondered if she did have a medical condition she was trying to tell me about and that's why she kept wanting to hang out with me. Though with our last visit to the vet, it seems like she is medically fine. And that she genuinely wants to hang out with me:

Could it be possible that grumpy Miss M has changed her ways?

Also:
Why Miss M gives me low self-esteem
Miss M is my "One"