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1. A child in college that does not support themselves can be claimed as a dependent regardless of their income. They will not qualify for the child credit - too old. This pushes them into the "other dependent credit". If it is not your child, then there is an income limitation of $5050. 

2. The filing sounds great with residency and non-residency.

3. Since she has already claimed herself, you can't claim her. Your return will be rejected if you try. Go back into the personal information section and mark that you are not claiming her. My only concern would be insurance. If she is still on your insurance policy, they may require her to be a dependent. That would mean amending her returns, getting a PIN for you to file with her and so on. She can get a pin quickly and that would allow you to have her as a dependent. See Get an identity protection PIN.

4. You can claim her again next year as long as she meets the limits.

If you want to mark that she paid over half of her expenses in 2024, this drops her from your return for this year and then you can edit her back in next year. This is a program thing, it doesn't go to the IRS. It just prevents her from going on your actual tax form.