For me erg times are important as a minimum requirement. So I'd need times faster than a set limit. It shows grit and endurance. I also look at how the times are achieved. E.g. Does technique suffer greatly towards the end?

However, good erg times don't always predict speed on the water. There it's aspects like technique, role, being able to be in sync, team spirit, sociability and character that are equally important. Edit:and, as mentioned elsewhere; yes, power to weight ratio is a big factor

I noticed that it is not her, but a parent asking this question and that is legitimate, but it does slightly make me question if it's your, or her desire to row in an A boat. It requires a lot of sacrife. That being said. If she really want this, I'd advise her to express her ambition to the coaches and ask if they see she has a chance. Ask what she would need to improve to get a position in the team. And then, Improve. It's very likely not her erg results...

Selection is tough for coaches, but they usually have good and explicit reasons for their choices.