Hi again! I decided to post here, because I want to thank you all for helping me with my decision Because this decision was based mostly on your replies here. I hope it's ok!
It's now over 1.5 year since we are together She turned out to be extremely independent horse. She didn't live with herd before and she didn't have best manners so she learnt how to live on her own. Herd issue was fixed when I put her for few months to a herd with 30 years old mare who taught her life. She also turned out to have umbilical hernia, so she had to go for a surgery in the beginning and had half a year rehab, but now she is completely healthy. Her independence is actually pretty nice thing, she is not very buddy sour although she has some great relationships in her herd, and she is not scared by almost anything when we go for trail ride. Her independence works against me when she has different opinion on some things, but she values my opinion more and more often
So this is us now! I am super super grateful to all of you for your advice!
She really is beautiful and a complete character, it sounds like you have become a great partnership. Sometimes the horses that it doesn't go completely smoothly with (eg the hernia) turn out to be the ones that you really 'click' with in the end.