[Crypto Noob Question] How can my Japanese wife withdraw her investments?

Complete Crypto noob husband asking on behalf of my wife:

My wife recently moved to the US from Japan. She had some crypto investments using crypto apps while living in Japan that she would like to withdraw, however she seems to have issues logging into her accounts from our US IP address. Would using some like a VPN just to login and withdraw funds be considered illegal, or is there a safe approach to this so that she doesn't get locked out of her accounts?

Please keep in mind, I am a complete noob. So please ELI5. How does this generally work to withdraw your crypto investments?

tldr: If you move to a new country, are you forever locked out of your crypto investments? Or is there a way to withdraw them safely?

edit: If she is able to login, what exactly is the process for "withdrawing" from a crypto account? Does she need to by some sort of USD currency and then sell that? Does she need a wallet setup in USD? I'm beginning my research today, but figured I'll throw the question in here in case the answer is quick and simple and can be confirmed by one of you fine folks. Thanks in advance for the help, we both really appreciate it!