It's so amazing some of the pictures you have gotten and how detailed they are! And even more amazing now that I know how determined you are to get them!
I'm nowhere near professional photographer level... I just used my phone and a couple times we used the non-phone camera we have had for years.
The better pictures were when she was eating or sleeping or laying down, and videos worked better for when she was moving.
I never used flash as I didn't want to startle her. I did notice that the camera in the phone must have made some interesting too-high-for-humans noise when it was focusing, as usually when we took pictures she would look at it curiously and want to get up close and sniff, and sometimes trying to focus the picture caused her to move around. Oddly, making videos didn't seem to get her as interested as taking one photo.