BTW @Mom2Engineers to an earlier point you made. Once you commit to a school, you have to attend or else your kid risks rescission from all colleges you got acceptances from. Most colleges enforce this rule very closely. The only exception is if they get accepted off the wait list after May 1st from a different school. The points the others made was that it can be beneficial to accept early to a school you like, since you’ll have priority on housing. But once you accept to that school, you can’t change your mind and by implication you can’t accept to multiple schools.
If your daughter’s heart is set on mechanical make sure she applies to that to multiple schools where she has a shot at getting admitted. ME is one of the toughest majors to get admitted to at any school. Some kids do apply to a easier majors in the hope that they can then switch to the desired one once they get into the school, but that is never a guaranteed possibility for such a competitive major.
And good luck 