Hi & :welcome1 to you & Sooty!
So glad that you adopted Sooty & now she has a wonderful home who loves her! RO is the place to come to learn more & to meet/chat with other bunny lovers! Everyone is so friendly & helpful! Sorry to say I can't help with her breed but there are many more experienced members here who might be able to shed some light on it for you. Make sure she has lots of good horse quality hay all the time as well as water. I like to use the heavy ceramic bowls for water. Glad you & Sooty have joined us & I hope you will make yourselves at home here at RO!
These are all the pics I can get.
Do you know how much your bunny weighs? Also can you post a belly picture? From the first picture she almost looked like one of my bucks. When I saw the second picture her belly looks almost white or cream and that is certainly not what a tan should have.
If she has white or cream on her belly then her color is blue otter and the breed could very well be just a mix.