Is there a way to ringfence a cash gift to a married daughter so that in the event of a divorce at some time in the future, that gift can be excluded from the joint marital assets, so that it will not then be divided between the two parties?
Not easily, no. One of the fundamental aspects of marriage is the pooling of property between the two partners. With the exception of clearly personal items, such as clothing and low-value items such as jewellery and electronics, a court will be reluctant to apportion ownership non-equitably at the time of divorce. That's particularly the case for fungible items such as money.
More generally, if you want to give your daughter money but with strings (like these) attached, then you aren't really giving her a gift at all. If you don't trust her to manage her own financial affairs sufficiently well, including making correct decisions in the case of some hypothetical future event, then find some other way of subsidising her lifestyle other than by means of an outright gift.
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