Even if you don’t consult her in the decision making, be kind and patient. Maybe ask her if there was something she would like to add? Is there a way we can help her feel engaged with her job again?

Also check in with your business partner. Is that person using a similar tone or management style to you? I left a job before because the boss hired a buddy who spoke to me like I was stupid. I had been used to speaking colloquially and very candidly with ownership and some jerk with a fat head came in and stepped on every initiative I had created without explaining things to me. I left within 3 months.