Even if you had bank statements to prove a transfer of funds, that doesn't prove that she had agreed to repay the money, so taking it to any court would be a waste of further money.
I've often read "never lend what you can't afford to lose", and I've recently (with our own daughter) taken the view that anything we "lend" is actually a gift. I know what she's like, and I know we'll never see any of it back. So now if we do give her any money, for whatever reason, it's on the (private, between husband and I) understanding that it's never going to be repaid. It's stopped me getting so stressed when I see her buying what I consider to be nonsense, and not making any effort to pay us back.
In your case, I think you need to decide what it is that you want now. Do you want the money repaid as a lump sum, or would you be happy with it being paid back in instalments? Do you need the money now, or are you looking at it as a nest egg for anything you need in the future?
I think I would write to your daughter, if she is avoiding you, reminding her of your verbal agreement, and asking how she would like to repay the money, and when she thinks this will be. If she doesn't respond, then I would say sadly you've seen the last of your money. And likely your daughter, if she's "hiding" from you now.