Unless your kid's a slapper, just shoot for a flat 3.0 home-to-first time. That's decent college speed. If she's a good slapper with a .500 OB% or better at quality showcase tournaments, she's college material - don't even bother measuring her speed - she's FAST!
If you REALLY want to get an accurate time, front toss to her, and time the run from contact. That's what the laser traps simulate, which are generally at the corner of the right batter's box. An HONEST 3.0 time will beat out a lot of left side hits and bunts at the high school and 12u level.
The variance in reflexes between different people can result in nearly a half-second error with a cheap stopwatch. The better camps will have at least 2 (sometimes 3) staff members running watches. With 3, they toss the high and low times and keep the middle.
OR... you can simply tell your friends that your DD has a home-to-first time of 2.5, home-to-home of 10.8 and has a 68 mph fastball. Yep - that sounds a lot better... :lmao: