College coaches do not care where they see a player play. Coaches know what they like when they see it so it doesn't matter where they see it, camp, club tournament, showcase event etc... What the coaches do want to see is athletes competing against the best competition possible.
If your daughter is not one of the best players i.e. "Top 25 - 50" players in the country than it is very important to express sincere interest in the school and the lacrosse program that she is interested in. Going to a camp at a particular school might help convince the coach that you are truly interested in that school. Coaches want players who want to be a part of their program.
