I agree, I think you should be able to race the race. She doesn't own it and it sounds like she's hurt and maybe insecure from her last experience.
It seems like she got wrapped up in an odd mental place. I can't imagine not wanting my friends to be in a race. First of all, it's their choice. And secondly, that's part of the fun, they push me and I push them. A little healthy competition is good!
I say go do it and race YOUR race. Have fun. And maybe you'll set an example that racing with friends can be fun.
"Live, more than your neighbors. Unleash yourself upon the world and go places. Go now! Giggle. Know. Laugh. And bark the the moon like the wild dog that you are!" - Jon Blais