You should really practice with her more when you can. That certainly would help you increase your fluency. Also true, there's something called mental barriers, it is uncomfortable but if you really mean it, you can actually overcome it. Because it's your goal to be fluent in the language.
I made a bet with a random person that I met in that app. I do not want to lose the bet and now I am studying it very seriously. I try to converse daily for 2 hours and hopefully by March, I can reach B1 fluency or more. I think exchange of knowledge and information happens when you make others feel confident and comfortable. Thanks for sharing your experience. It's really valuable!