I do recall my kids doing the 50m in grade school.I will say she is the rabbit out of the gate for the longer leg girls who chase her down and always end up winning every freaking race. At first I thought she had a chance with some extra training but no way. It's bio science or something like that. Her timing on the gun and breakout is amazing her coach said and she is usually in the lead after 25 meters. Oh well, no 25 meter race so she is after her PB in the 100. She might do a relay later in the season, depending on her time. She wants the relay badly. Good luck with coach talk bro. I know you dont want to do it but sometimes you have to speak up.
Your kid definitely has a shot in the 100m, just has to leverage that strength of coming off the blocks and building that lead. Best of luck to her!