Playing on a 2's team, versus a 1's team, for a libero has very little impact. College coaches understand teams won't carry 4 or 5 liberos like they do hitters; we know that 2's and 3's club teams will have talented liberos/ds's available. We judge talent, not the team number.
Families have to remember that it all shakes out in terms of playing at the appropriate level in college - If you have elite DI talent and reach out to these schools, then you will play elite DI volleyball. If you have D2 talent, and reach out to D2 schools, then you will play D2 volleyball. It is rare you see a D2 college player and think, "she should really be playing at an elite D1 school".
Unfortunately, families will internalize volleyball evaluations and turn them into personal or family evaluations. If she made the 2nd team, there was probably a reason related to talent level/physical ability and the family should realize that if they want her at a 1st level team, she should work to get better.
College coaches don't have a 2nd team to place kids on in the don't perform; the coach just cuts the player. This is when the hard truth often hits families.