What kind of brush do you use? If you use a slicker brush, might be uncomfortable for her. Our yorkie love to be brushed but she really hates the slicker brush. Try with a pin brush and comb and be gentle. Give her some treats and be patient. With time she will love the brushing.
By the way you can check this:
https://yorkiemag.com/what-is-the-best-yorkie-brush
According to the bathing and nail clipping it's the same thing - it must be positive experience for the dog. Don't just get her and start clipping the nails.
Let her first get used to the nail clipper, let her sniff it than give her a treat. The next day repeat that. She has to be relaxed around the clipper and than start cutting the nails. It takes time and lots of patience get there and some dogs just don't get used to the nail cutting..
Our Yorkie still hate this but at least allow us to cut the nails.
I think this will be helpful for you:
https://yorkiemag.com/how-to-groom-a-yorkie-at-home