NFHS-Runners on first / second slapper hits ball towards short. Short runs in looking like she is going to attempt a play, but stops as base runner is about to pass in front, argument obviously was that she stooped to avoid collision. No contact was made. Interference??
NFHS does not require contact for an interference call. All of the rules are designed to prevent collisions. If the runner causes the fielder to change how they play the ball, there is interference.
When there is contact the call is automatic. Without contact you bring the umpires judgement into play. It sounds like interference to me.