I think the vast majority of responses on here show why we have such entitled youngsters these days. If so many of you are prepared to write off such a large sum as £2k, just because your little darling decides to take the piss, it's no wonder that these youngsters treat everyone else as if the world owes them a living.
If someone asks to borrow money, no matter who from, they should expect to pay it back. Having been put in a situation with my DS, where he has begged me to lend him money, I know how hard it can be to say no, especially if you have the money sat in the bank. When it's your own child, you should be able to trust them to pay you back, and if they can't for any reason, they should come to you and explain what the problem is, and try and work something out, not ignore you, and bury their head in the sand, risking their relationship with someone who actually cared enough about them to help them out in the first place.
I think that it's quite likely that the OP, knew that her daughter wasn't good with money, although did what she could to support her at the time, but also wanted her to accept that she had a responsibility to pay the money back, hence the written but very flexible agreement, but then to be treated like shit, it's no wonder she spoke to a debt agency. She doesn't actually say that she sent in the bailiffs or anything, but as so often happens the nasty side of MN has reared it's head, and possibly made her wish she'd never posted for advice in the first place, which is why she hasn't come back.
I'd love to know how many of you holier than though people on here, have found it easy to refuse to lend money when caught on the hop by a family member, or would really be prepared to just gift their adult child £2k, at the drop of a hat, when it might just be the difference between you being able to afford a holiday, or pay an unexpected bill.