“Can this be claimed as a capitol loss?”---->I don’t think so; capital loss is loss on the sale of an investment asset, such as stocks, bonds, or mutual funds. A loss is incurred if you sell the investments for less than what you paid for it.
“as we have with bad personal loans.”----> To be a bona fide debt, there has to be a debtor-creditor relationship between you and your daughter, and there has to be a valid and enforceable obligation for repayment. The main idea here is to show that, when you made the loan, you intended and expected to be repaid. So, if you lend money to a daughter and there's no understanding between you that it must be repaid, you've made a gift, and you can't take a deduction for a gift. An oral agreement may do the job, but something in writing is better. A simple loan document showing who's borrowing the money and how much, and when and how it's to be repaid will usually be enough to show a bona fide debt.