Would need a picture of her squared with the tall grass to be sure, but nothing really negative jumps out at me, she looks lovely! I think she'll work very well for what you want to do with her. And I love
Blue Max bloodlines. My horse Dallas(also a solid paint) is Blue Max blood on the sire's side, and Jetalito blood on the dam's side. He has a bunch of other winners mixed in but those are the main two. And from my five years owning him he has been the most talented and fun horse I have ever met. Of course not every horse from a certain bloodline is alike. But I also know another gelding with Blue Max who is once again super talented and really great to work with. So my expierence with the line has been a very good one. And I've heard good things about Doc O'lena/ Doc Bar lines but have never experienced them for myself.
But back on the subject of this filly, I would definitely go look at her in person. She seems like a really nice little little, I'd be excited to see how she turns out when she grows up. Let us know how things work out!