for example Stanford states that families making under 125K pay nothing. for the family making $125, 001, it is a whole different animal
For example, Dartmouth(which is one of OP’s choices ) provides free tuition and no loans for families making less than $100,000 with typical assets.
If the $33,000 of increased income pushed the family over the $100k mark, then all bets are off and it is a totally different outcome
Op’s other school is Cornell
Again, an increase of 33k in income will be a game changer for the family’s financial aid award.
Possibly moving both schools from affordable to unaffordable because neither school is going to change their policy if Op’s family goes over the income threshold.
In answer to your question, of course schools (including ivies) lose students over aid. If you cannot pay the bill you cannot attend classes.
Don’t go into this thinking that if I attend, they will not take away my aid. They will and your package will go up or down depending on the income. If the 2019 income means that you are no longer eligible for the financial aid programs, then you will have to look at a school that is affordable over the course of 4 years