Who is Ursula Brangwen from Women in Love and what is their importance?

Ursula Brangwen is a school teacher at the beginning of Women in Love. She is more serious and less finished than her sister Gudrun, but she is also more womanly, more vital, more sure of herself. She has a relationship with and then marries Rupert Birkin, warring with him over the definition of love, and what should be possible between them. She is a proud and independent woman who refuses to be bullied and insists on doing things because they make sense to her because she wants to do them herself.