So you want her to wear a symbol of something that belies her personal beliefs? Is that not also the very definition of hypocrisy?
Your assumption that she is prejudiced against gays based upon her choosing not to wear a jumper that is meaningless to her choice to participate in sport is offensive. She has acted, in my opinion, in the correct manner.
Some time ago I worked for a large company that left a pride emblem on the desk of all the staff. Staff were encouraged to display it. The emblem stayed on the desk, untouched. Three reasons: It had nothing to do with my employment. I am not gay. It wasn't my choice.
If you meet me in person I will treat you with love, respect, and kindness. I won't wear your symbols. I won't make you wear mine.