Most schools don't allow long term absence. If she is already absent from school for many days, due to playing chess tournaments or other activities, it's hard for her to take another two weeks from attending school. Sometime school work load is too heavy, especially for middle school and high school students. Making up homework and tests would be an insurmountable task. The parents may also lack vacation days to accompany the child. If the tournament is at the beginning of the school year, that will be terrible for most students. No teacher will like a student who shows up for one week then gone for two weeks. That's one reason US had smaller delegation in 2014.
The cost of 5K or more is another problem. Some parents are doing fundraising locally or publicly. But most won't due to privacy or other concerns. 5K can cover at least 5 major tournaments in US (no flight), or most small tournaments in a year. So every parent has to balance the investment and return, making decision after comparison.
If you don't have the above two issues, or you can work around, definitely your daughter should go.