What is your daughter planning on doing during summer break? If everybody leaves to another town to work, you would potentially be losing 4 months of rent.
Residence sounds like a far better solution, economically. Food is provided (presumably through a meal plan); no need to worry about vehicle transportation to university; universities generally have enough entertainment and activities to keep people from getting bored.
Buying doesn't seem like a great proposition considering she will only need it for another 3 years, and you'll need to find ways to keep it occupied during summer break, or eat the cost every year.
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