I was having a conversation with one of my friends the other day and he said that she is high Jonin level, but I don't think so. I think she is High Chuunin-Special Jonin level at best.
naw she is jonin level simply because she has 95% of tsunade's abilities and tsunade didnt even have the byakogu when she was a jonin because when oro first seen her use it during their 3-way sannin deadlock he said i see i wasnt the only one who experimented when they left the village...
sakura is better than all the female jonin in konoha and is better than most male shinobi in nv which includes bunch of jonin fodder like ebisu and iruka and im sure she is capable of beating fuu and ibiki and chouza, she is capable of beating jonin...so that makes her a jonin and she has some of the best chakra control in nv
In the interest of Complete Fairness. She seems to be Better at this point than Tsunade. Taking in account that Tsunade was able to become a Sannin, and the 5th Hokage. It wouldn't be unreasonable to state that Sakura is High Jounin - Kage level of ninja. However Due to the lack of experience she falters when compared to a Hokage. So I'd personally rank her as a Jounin.