My daughter ran track last year and heard she did quite well -- I'm very sorry to say I couldn't make one of her meets because I coach HS softball. I feel that it helped her speed and other ability with travel ball. She actually hurdled a catcher last year crouching to make a tag. My other theory is I want to "keep the peace" with her and allow her to do other things besides softball. She's also a pitcher and we practice 5 hours per week and if all I drill in her is softball, softball, softball, then she may get burned out on it.
The "rule" is, however, if there's conflict, softball comes first. Very seldom, there's a conflict because track meets are mainly after school on weekdays. If she wants to run track again this year, I can't say 'no'.