It's a HUGE difference pitching with 1 foot or 2 feet on the rubber. And next to all the people that gripe about crow hopping, it's my biggest pet peeve of the rules. Why are the pitching rules (2 feet) still in existence from 1950 when hitters get composite bats from 2016? It's incredibly unfair. The rule needs changed.It is a big advantage to start with only one foot on the rubber. The adjustment going between one foot and two feet shouldn't be any more difficult than going to regular pitching after doing the 2-step and pushback drills.
She will feel stronger with only one foot on the rubber.