What do you do in such a scenario?
By law, a citizen cannot be deported from the country, but if citizenship was acquired and the person is subject to deportation, steps should be taken to preserve the seed phrase online. There are many ways to do this, and encryption can help. Simply remember your email password.
What are you saying? If you are not in America haven't you heard how Trump was deporting many people like very quickly? What part of the world are you from? What law are you reffering to? If the citizenship was required, that shows they are migrants, if they misbehave they will go back to their country.
We don't know what this woman did, it is a shame that we don't, but I am sure that if ICE is involved then she is likely not who we think she is, and even if she has her recovery seed on her it is still risky, if the money inside is a lot the agents might take over the wallet and send her on her way, at least she is leaving the country anyway, before she knows what is happening the deal is been done.