You need to document everything.
Also respond with email for a record.
E.g.
"Jane, you told me to go and tidy the stock room, if there's something you think needs to be done, please speak to our manager, Bob who will decide who should do it."
"Jane, In the client meeting when you said 'are you sure about that,' to me after hearing my calculations it undermined me in front of the client and made the company look unprofessional. As you know, the figures were, in fact correct. You had misunderstood the VAT exemption.
If you have concerns in the future please address them in a more professional manner."
"Jane, your comments that my dress 'shows every lump and bump, were inappropriate.' if you have any issues with my clothing in the future, please direct them to our manager."
For every single thing.